Finishing Archives - Woodworking | Blog | Videos | Plans | How To https://www.woodworkersjournal.com/category/how-to/woodworking-skills/finishing/ America's Leading Woodworking Authority Thu, 15 Aug 2024 20:35:24 +0000 en-US hourly 1 https://wordpress.org/?v=6.5.5 Understanding Surface Sanding https://www.woodworkersjournal.com/understanding-surface-sanding/ Fri, 16 Aug 2024 15:00:15 +0000 https://www.woodworkersjournal.com/?p=70310 Ensure you have a completely flat surface to work with thanks to these helpful tips from A.J. Hamler.

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Smoothing large, flat surfaces is a sander’s bread and butter. Observe all the above practices, along with a few more.

Always keep the sander moving without forcing it. This not only makes smoothing more uniform and allows dust to be evenly collected, but it also helps prevent scratching or digging in. Done correctly, a sander should glide lightly over the work.

In terms of feed speed, here’s a good rule of thumb: move a random orbit or orbital sander over the workpiece at no faster than about one foot per second.

Uneven panel surfaces and tabletop glue-ups may need special attention, and this is often where tilting the sander is tempting. Although possible to effectively level a panel with a random orbit sander, it’s time-consuming and invites error. Instead, this is a good place to call in a belt sander with its large, flat pad that more easily bridges high spots.

Using light and ruler to find uneven spots on a panel
Before sanding a panel, use a raking light and a long rule or straightedge to locate and mark high spots. Do this frequently during sanding until no light shows underneath.

First, locate all the high spots. Use a raking light to show where light sneaks under a reliable straightedge. High spots will be dark, with light shining on each side. Use a pencil to mark the high spots as you move the straightedge over the surface.

Using belt sander to flatten a large panel
Start belt-sanding at a diagonal to the grain to tackle the high spots first. Use a medium- or coarse-grit belt. Keep the sander moving and don’t be tempted to add pressure to speed up the task.

Cut the speed on your belt sander way down, and sand diagonally over the high spots to remove the pencil marks. Stop frequently and recheck with your straightedge to monitor your leveling and find remaining high spots.

Smoothing scratches off a wood panel with belt sander
Once the high spots are gone, switch over to sanding with the grain to remove diagonal scratch patterns when leveling the surface. You might even consider switching to a finer-grit belt, too.

Once the high spots are leveled, sand with the grain to remove diagonal scratches. Again, keep the speed down and the sander moving, overlapping with each pass. The goal here is making a uniform surface, not finish sanding, so go with a light touch.

Finish sanding a panel with a large sanding block
If there are any stray high spots left, hand-sanding with an extra-long sanding block can level them quickly. Once level, sand with the grain to blend it in.

The last step is to recheck for high spots with your straightedge. Any remaining spots should be small. Hand-sanding with an extra- long sanding block works best to level these stragglers, followed by smoothing through all the grits with a finish sander.

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Sanding Techniques and Best Practices https://www.woodworkersjournal.com/sanding-techniques-and-best-practices/ Fri, 09 Aug 2024 15:00:17 +0000 https://www.woodworkersjournal.com/?p=70275 Sanding is pretty intuitive, but there are both good practices and bad. A.J. Hamler takes a look at a few.

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Dust collection is important everywhere in the shop but even more so with sanding, which creates extremely fine, near-invisible particles that can float for hours. Fortunately, nearly all modern sanders have some means of dust handling. An internal impeller draws dust in through openings in the sandpaper and forces it out through a port, usually into a bag or canister.

Emptying dust tray from hand sander
Dust collection for sanders has advanced tremendously, but you still have to remember to empty the dust compartment! With an attached vacuum hose, no emptying is required.

Even better is to replace the bag or canister with a direct hookup to a shop vacuum or dust-collection system. Adapters like Rockler’s Dust Right FlexiPort system are extremely helpful for connecting most sander models.

Power sanders with speed control dials
It’s not always necessary to run a sander at top speed, and sometimes it’s detrimental. Most quality sanders now include variable speed. Use it!

For finish-sanding or polishing, high speed is great. But for most other sanding chores, constantly running sanders at their top speed can prematurely wear out abrasives, unexpectedly over-sand delicate workpieces, overheat motors, raise vibration, cause the sander to dig in and even make the tool harder to control. All quality sanders have speed controls these days. Don’t neglect them.

Holding sander flat against project
It’s tempting to tilt the sander to dig in to quickly eliminate high spots. But you can inadvertently damage the workpiece or even the sander’s orbital mechanism by doing so.

Two other poor techniques go hand in hand. The first is the oh-so-tempting practice of tilting the sander on-edge to quickly level glue joints or joinery. Yes, it works, but the odds of a poor result are high. It’s deceptively easy to sand a depression into the material. It also retards the spinning mechanism of a random orbit sander, defeating the whole purpose, and it invites swirls and scratching. Do this a lot, and you’ll also wear out the mechanics that make random orbits possible.

Motion of sanding a large panel
Regardless of which sander type you’re using, always keep it moving in overlapping strokes. This will help achieve a level surface, minimize marks and swirling and generally sand far more efficiently.

For the same reasons, don’t force the sander down into the work. Too much pressure overstresses the motor, slows down the random orbit pattern and causes swirls and scratching. Excess heat shortens the life of sandpaper and encourages clogging. Instead, hold the sander tightly enough for control, but let the weight of your hand and the sander itself do the work.

Vacuuming wood between sanding passes
No matter how well a sander collects dust, there will always be some left on the workpiece, possibly mixed with loosened grit. Vacuum the surface between grits.

All woodworkers know to “work through the grits” for a gradual smoothing, but it’s easy to skip the important step of cleaning the workpiece between grits. No matter how efficient your dust collection is, dust always adheres to the surface along with loosened grit. The next-higher grit simply grinds this all into the surface. Always brush — or better yet, vacuum — the surface thoroughly between grits.

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A Bit About Abrasives https://www.woodworkersjournal.com/a-bit-about-abrasives/ Wed, 31 Jul 2024 15:00:30 +0000 https://www.woodworkersjournal.com/?p=70240 In this article in his sanding series, A.J. Hamler discusses the different types of sandpaper common to woodworking and their applications.

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Despite the name, sandpaper isn’t made with sand. Natural minerals like flint and garnet were once mainstays but have largely been replaced with synthetic materials. Neither garnet nor flint is particularly friable, meaning that the grains don’t fracture to expose fresh sharp edges as well as others. They’re okay for hand-sanding but wear quickly with machine use.

Several different grit and types of sandpaper
There is an enormous range of types and grits of sandpaper in both sheets and discs. The most commonly used in woodshops is aluminum oxide, but ceramic-based abrasives are becoming more popular.

The three most useful abrasives for woodworkers are aluminum oxide, silicon carbide and ceramic.

Aluminum oxide is by far the most common material. It’s moderately priced, very friable and has a decentlifespan. You can’t go wrong making this type your go-to for day-to-day use. It’s also the most readily available due to its popularity.

Silicon carbide is a harder, sharper material that lasts longer than aluminum oxide. It’s often available in extremely high grits — I have some 2,000-grit in my shop — and it’s great for wet-sanding and rubbing out finishes. It’s also a bit more expensive.

Ceramic abrasive paper for woodworking is more recent. It’s very hard, and although somewhat less friable than the other two types, the grains remain sharp until depleted, making it incredibly tough and aggressive. It’s a bit pricey by comparison, but it easily lasts the longest of the three.

Sandpaper is either open- or closed-coat. Open-coat paper uses less grit, creating spaces between the grains that help prevent clogging or “loading.” It’s best for softwoods and other high-resin materials. Closed-coat is just the opposite, with the grains densely packed together. It’s best for harder, low-resin woods and for hand-sanding.

Replacing a used sandpaper disc
The author pushed this used sanding disc (left in photo) a bit too far before changing out for a fresh one. Note the tears on the edges and the thin spots where abrasive has worn off.

Speaking of longevity, it’s natural to want to use a disc or belt as long as possible. But overused sandpaper is an exercise in diminishing returns. Resin buildup, torn edges and dust holes and “bald” spots all lessen sandpaper’s effectiveness, leading to poor results that, maddeningly, take longer to achieve. Check your paper often, and discard paper sooner rather than later.

Refreshing sandpaper disc with a cleaning block
If a sanding disc still has plenty of abrasive but becomes clogged, a gum-type cleaning block can bring it back to life. Here, the author has cleaned just the center of a fully-clogged disc to show how well it works.

That said, if paper is still fairly new but clogging, extend its life by simply cleaning it. A stiff brush — an old toothbrush or even a soft wire brush — can remove a lot of buildup, while a gum cleaning block helps with more serious clogging.

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General Finishes Dead Flat https://www.woodworkersjournal.com/general-finishes-dead-flat/ Fri, 31 May 2024 15:00:16 +0000 https://www.woodworkersjournal.com/?p=69829 General Finishes' water-based polyurethane topcoat adds protection to bare or painted wood without imparting color or altering sheen.

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General Finishes Dead Flat, a durable matte sheen is included in its High Performance Topcoat lineup. It’s a single-component water-based cabinet and furniture-grade finish that can be brushed, sprayed or rolled.

Painting wood with a dead flat topcoat

Christine Adams, marketing director for General Finishes, reports that this cross-linked polyurethane is an ideal topcoat for protecting figured woods and can be used over paint that already has a flat sheen. “With Dead Flat, the beauty of the wood grain displays with natural clarity, and the color of painted projects shows with more intense saturation,” Adams says.

Comparison of painted wood with and without topcoat
Dead Flat imparts no color and doesn’t alter the sheen of painted or bare-wood surfaces once it dries.

Due to recent advances in its patented polymer technology, General Finishes has formulated Dead Flat without the use of the durability reducing matting agents required in the past. This gives it the durability of higher gloss finishes with a more natural appearance and low luster.

Adams reports that Dead Flat has a <5-degree sheen (compared with the company’s Flat Out Flat product that has a <10-degree sheen), with improved chemical and water-resistance properties. It meets KCMA durability standards, contains no Prop 65 chemicals, uses renewable resources and is VOC compliant nationwide.

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Bumblechutes Food-safe Finish Options https://www.woodworkersjournal.com/bumblechutes-food-safe-finish-options/ Wed, 27 Mar 2024 15:00:34 +0000 https://www.woodworkersjournal.com/?p=69379 Bumblechutes' Woodworker's Oil and All-In-One Wood Conditioner are ideal for kitchenware.

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If you could use an eas-yto-apply finish to keep cutting boards, wooden bowls, butcher blocks and other utensils protected and looking new, but you’re concerned about their food safeness, New Hampshire-based Bumblechutes has two new options. Its Woodworker’s Oil is a wipe on/wipe off solution made of 100 percent pure fractionated coconut oil, vitamin E, mineral and lemon oils. It soaks in to revitalize dry-looking wood to help preserve its rich color and off er some stain-inhibiting and UV pro-tection properties. The thick liquid can simply be flooded on and allowed to soak in for 30 minutes, then the excess wiped off. Or, submerge the object for up to 8 hours for deeper grain absorption. All-In-One Wood Conditioner is a soft paste made of premium-grade U.S. beeswax, organic carnauba wax, vitamin E oil, zinc oxide and lemon oil. It contains no petroleum solvents. Bumblechutes says All-In-One Wood Conditioner has “deep penetrating power to saturate and seal wood fiberseff ectively,” which will protect against moisture swelling, chipping and cracking.

Containers of Bumblechutes wood oil and conditioner
Bumblechutes offers two worry-free wipe-on fi nishes for maintaining wooden kitchen utensils.

It applies with a cloth and, after the excess is wiped off , dries on the surface in about 20 to 30 minutes. Bumblechutes recommends that the paste be reapplied every two to four weeks. It can be used as a stand-alone finish or to improve the moisture resistance of surfaces treated with Woodworker’s Oil.

Both products have a pleasant, lemony smell when first applied. Rockler sells Woodworker’s Oil in 8.45 oz bottles. All-In-One Wood Conditioner comes in 4 oz glass jars.

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Back to Basics: Milk Paint https://www.woodworkersjournal.com/back-to-basics-milk-paint/ Fri, 01 Mar 2024 16:00:20 +0000 https://www.woodworkersjournal.com/?p=69196 A variety of rich colors, matte sheen and surprising durability make this finish popular.

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Before the advent of petroleum-based paints, casein (milk protein)- based paints were commonplace. In recent years, these historically inspired paints have had a resurgence in popularity among DIYers, crafters and woodworkers alike. Part of that revival has to do with the nontoxic nature of this powdered paint. It is VOC-free, making it a safe and eco-friendly option for indoor or outdoor use.

Spreading milk paint on a wood panel

Other benefits include milk paint’s versatility and visual appeal. It can be applied over absorbent surfaces such as wood, concrete, plaster or brick without the need for primer. It is UV fade-resistant and will accept all topcoats and finishes, which can alter the sheen or add even more durability. Milk paint dries quickly without residual odor and cleans up with water. Waste paint is worry-free, too — just pour it down the drain, flush it or compost it.

Can of The Real Milk Company Milk Paint
The Real Milk Paint Co. water-based milk paint can be applied with brush, roller or sprayer.

The Real Milk Paint Co. Milk Paint, now available in an assortment of colors from Rockler, is made from natural ingredients: casein, lime, pigments and a plant-based filler. The paint is simple to prepare for use by mixing it 50/50 with tap water. Each can includes 11⁄4 cups of paint powder and a handy glass mixing marble. Pour the amount of dry paint and water you need into the plastic can, drop the marble in, snap on the lid and shake the can vigorously for 5 minutes.

Once mixed, the paint is workable for up to two weeks if kept refrigerated. In powdered form, it’s shelf stable and will last for years. The dry contents of the can forms one pint of liquid paint, which covers about 35 sq. ft.

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Clapham’s Beeswax Salad Bowl Finish https://www.woodworkersjournal.com/claphams-beeswax-salad-bowl-finish/ Wed, 31 Jan 2024 16:00:04 +0000 https://www.woodworkersjournal.com/?p=68975 Clapham's Beeswax Finish is as simple a recipe as a wood finish can ever be!

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Most wood finishes are food-safe, once their solvents have flashed completely off and the finish fully cures. Even so, there are project applications where your conscience wants all risk of toxicity to be a non-issue, right? Think hand-carved spoons, wooden bowls or serving pieces and children’s toys.

Clapham’s Beeswax Salad Bowl Finish can alleviate any niggling concerns you may have, because its ingredients couldn’t be simpler: beeswax and food-safe mineral oil. That’s it! It contains no harmful chemicals or additives.

Unscrewing the lid and taking a deep breath of the contents will confirm the beeswax immediately — it’s subtle and the only discernible smell this product has. Clapham’s has formulated the wax emulsion to be firm enough to be solid but not so stiff as to prevent it from loading easily onto an applicator. Rubbing it over bare wood, the wax immediately liquefies and penetrates into the grain, darkening it without imparting a shine. Once it dries, the wood takes on a flat appearance again, as though the surface is damp but entirely dry to the touch.

Jar of beeswax salad bowl finish
Clapham’s Beeswax Salad Bowl Finish is completely food-safe and easy to apply.

Aside from being food-safe, the other upside to a natural blended-wax finish is that it couldn’t be simpler to apply: wipe it on liberally, give it a few minutes to soak in and wipe off the excess. The downside, however, is that it will need to be reapplied often and off ers only slight water resistance and protection.

Clapham’s Beeswax Salad Bowl Finish is suitable for wooden bowls, spoons and butcher blocks and can also be used as a cutting board wax or as a food-safe countertop finish. It comes in a 7 oz jar and sells for $19.99.

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Rubio Monocoat Oil Plus 2C https://www.woodworkersjournal.com/rubio-monocoat-oil-plus-2c/ Wed, 27 Sep 2023 22:22:07 +0000 https://www.woodworkersjournal.com/?p=68198 This hard wax finish has been making waves in the woodworking world with its single-coat application and coloring process.

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Rubio Monocoat products have become very popular with woodworkers. As the name implies, Rubio claims that a single coat of their product will be sufficient for woodworking applications from flooring to fine furniture. Considered a “hardwax oil,” it is made from a blend of plant-based natural ingredients.

The company claims 0 percent VOCs with no solvents, which is desirable for many woodworkers.

One Coat?

Board with one end finished with Rubio Monocoat
An application of Rubio Monocoat will cure in about seven days if mixed with the hardener. It will cure in about three weeks without the hardener.

The hardwax oil does go on with one application, but there are caveats. First off, after sanding to 150-grit, you need to get rid of the sawdust. After vacuuming the swarf away, Rubio suggests using their Raw Wood Cleaner to remove the tiniest dust particles. Some woodworkers use mineral spirits as an alternative.

If you believe in raising the grain with water before finishing, now is the time to do it. When the wood dries, whisk off the raised grain with a synthetic pad.

You can apply Rubio Monocoat without using the hardener, but it will take about three weeks or more to fully cure (much like tung oil). Or, add one part hardener to two parts oil and mix them together well. Choose a section of your project that you can complete in about 10 to 15 minutes. Pour the oil onto the wood surface and use a plastic spreader, synthetic scratchy pad or a rag to spread out the finish. A little oil will go a long way. Allow the oil to sit for about five minutes and then buff the oil into the wood. When that’s done, remove any extra oil with a soft, clean, lint-free cloth.

Rubio Monocoat dries to a very low-luster finish that feels smooth and silky. It’s formulated in 50 different colors, including one that’s basically a clear coat.

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Sam Maloof Poly/Oil Finish https://www.woodworkersjournal.com/sam-maloof-poly-oil-finish/ Wed, 26 Jul 2023 20:55:34 +0000 https://www.woodworkersjournal.com/?p=67687 Achieve a legendary woodworker's finishing results on your interior projects with this grain-enhancing, satiny topcoat from Rockler.

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The late master woodworker Sam Maloof preferred hand-applied, low luster finishes for his sinewy walnut rockers and other furniture. “One of the most important aspects of finishes, I believe, is that they invite me to touch, to caress and to take pleasure in the wood surface,” Maloof said.

More than 20 years ago Nordy Rockler partnered with Maloof to develop a signature wood finish that not only would meet Sam’s expectations but also provide an easy-to-apply solution for woodworkers of all skills levels. Rockler’s Sam Maloof Poly/Oil Finish is the result. It’s a custom blend of polyurethane varnish and other natural oils, including raw tung oil and linseed oil, that can simply be wiped onto bare wood and dries to a satiny “close to the wood” sheen.

Spreading an oil and wax finish on a knife block

This moderately thick liquid has an amber tone that deepens wood color and grain patterns while offering protection against spills and normal wear and tear. Use it on interior furniture, cabinetry, millwork and accent projects that won’t be exposed to heat or excessive moisture. When the wood looks dry, the finish can be reapplied as needed without sanding or stripping the project first.

Can of Sam Maloof's finishing mixture and a finished knife block

Sam Maloof Poly/Oil Finish is suitable for bare or stained wood of most species, provided the stain is fully cured. For optimal results, sand the wood up through the grits to 400 or even higher, then burnish the surfaces with 0000 steel wool. Apply the finish liberally and wipe off the excess completely to prevent excess finish from becoming tacky. After the finish dries for 24 hours, subsequent coats can be applied. Allow each coat to dry for 24 hours. Four coats are recommended.

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Walrus Oil Cutting Board Oil https://www.woodworkersjournal.com/walrus-oil-cutting-board-oil/ Fri, 12 May 2023 15:00:10 +0000 https://www.woodworkersjournal.com/?p=67136 Here's an easy-to-apply, easy-to-renew finish that's food-safe and made from products you won't need a chemistry degree to understand.

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Woodworkers concerned about the safety of finishes they apply to cutting boards, charcuterie boards and other projects that come in direct contact with food can rest easy with Walrus Oil Cutting Board Oil. Belying its rather cheeky name, it contains no essences of long-tusked Arctic mammals. Instead, it’s a handcrafted proprietary blend of products you’ve heard of before: coconut oil, mineral oil, vitamin E and beeswax.

Made in the USA, it is FDA-approved for food contact surfaces such as cutting boards, butcher blocks and wooden countertops, does not solidify under normal conditions, is highly shelf-stable and has virtually no scent.

Bottle of Walrus Oil cutting board finish

This wood finish goes on smooth — not too thick and not too thin — and it won’t impart a strange taste to food. It will leave your cutting board with a silky smooth finish, rich color and a little shine while it helps protect the wood from food stains and keeps it looking new. Rub on two coats for even more depth and color.

Walrus Oil Cutting Board Oil is available in an 8 oz squeeze bottle from Rockler. Or you can purchase quart-sized or even larger containers directly from the manufacturer by visiting walrusoil.com.

Cannister of Walrus Oil Wood Wax

Walrus Oil Cutting Board Oil is just one option among a growing family of wood care products. A denser formulation — Wood Wax For Cutting Boards also available from Rockler — is made of the same ingredients as the oil but comes in a 3 oz tin. Apply it as you would other furniture or car waxes, let the wax dry for 15 minutes and buff it with a rag. It can be used over Cutting Board Oil for added protection or applied as a stand-alone wood preservative.

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