Essential Guide to Materials for Restoring Wooden Furniture

Finishes, stains, fillers, and sealers differ from one project to another and degrade over time. If you're tackling multiple refinishing jobs, it's a good idea to keep a small stock of these materials. Otherwise, you can buy them as needed for each project. There are, however, some fundamental repair and refinishing materials that should always be available, such as abrasives and adhesives. In this article, we will go over the must-have materials for your workshop.

Paint and Varnish Remover

There are several types of removers available. Less expensive options typically contain wax, can be toxic and flammable, and must be removed with scrapers or abrasives. On the other hand, premium removers are nonflammable, non-toxic, and some can even be wiped off with water. You’ll also find wipe-on, wipe-off removers and gel versions, many of which are gentle and simple to use. Testing them out will help you figure out the best option for your needs. The liquid works well on flat surfaces, while the semi-paste is better for vertical surfaces, like chair legs, where the remover needs to stay in place.

Abrasive Materials

Abrasives, vital tools in furniture refinishing and repair, serve a key purpose beyond just removing old finishes. While sandpaper once played a major role in preparing furniture for refinishing, it has been partially replaced by various chemicals and gentler abrasives. Many professionals still use sandpaper regularly, but others prefer to avoid it altogether, opting for steel wool and abrasive powders instead.

While sandpaper can theoretically be used throughout the refinishing process, many people prefer using it for rough work, steel wool for both stripping and fine sanding, and pumice or rottenstone for finishing touches. The best approach is to experiment and gain experience.

Sandpaper

Sandpaper comes in various types, both organic and synthetic. Organic options like flint paper and garnet paper are affordable but tend to wear out quickly. Synthetic alternatives such as aluminum oxide and silicon carbide are more durable, lasting longer and available in finer grits compared to organic papers. Emery paper, typically used for glass or metal, is not suitable for wood and should only be used for cleaning furniture hardware.

Some professionals exclusively use synthetic papers (aluminum oxide and silicon carbide), while others argue that the less expensive organic papers, especially garnet, are adequate for most refinishing and repair tasks. However, it’s clear that flint paper, although the cheapest option, wears down fast and may cost more in the long run. Flint paper is best for sticky surfaces where sandpaper usually becomes ineffective quickly. For other surfaces, synthetic papers cut faster and are easier to work with than organic options.

To determine if synthetic sandpapers are worth the investment, begin by using garnet paper, then try a synthetic paper for your next project. If you notice a significant improvement, the higher price may be justified; if not, you can return to garnet paper. Always choose sandpaper based on the job and its required grit.

Steel wool and abrasive powders are also essential materials to have in your home workshop. Discover their numerous applications in the following section.

Workshop Materials: Steel Wool, Abrasive Powders, Adhesives

Steel wool, abrasive powders, and adhesives are indispensable materials for any home workshop, particularly if you're involved in furniture restoration or repair projects.

Steel Wool

Steel wool, available in various grades from medium to superfine, has become a key tool in furniture restoration, primarily used for smoothing surfaces and removing finishes softened by paint remover. It is especially helpful for delicate veneers and inlays where the surface is thin and sandpaper could cause damage.

One limitation of steel wool compared to sandpaper is its inability to smooth rough surfaces effectively. Steel wool also has its drawbacks: some professionals believe it clogs too quickly and leaves behind steel particles. Always use the appropriate grade of steel wool for the task at hand. If you're unsure about which grade to choose, refer to the Types of Steel Wool sidebar for guidance.

Abrasive Powders

For very fine sanding of finishes and certain surface repairs, pumice and rottenstone powders are commonly used. Pumice, which comes in grades from F to FFF, is slightly coarser than rottenstone. Both are excellent for smoothing final finishes and removing stains. Start with rottenstone, and if it proves too gentle, try using pumice for more abrasive action.

Pumice is available in grades ranging from F to FFF. It serves as a fine abrasive, ideal for use between layers of finish and for the final buffing. Additionally, pumice is effective for removing stains when combined with oils like linseed oil.

Rottenstone, which is even finer than pumice, does not come in graded variations. It is typically used for buffing between coats, as well as for the final buffing and stain removal.

Adhesives

In furniture repair, you'll likely work with a range of adhesives. Your choice will mostly depend on personal preference, but it's important to consider a few key differences. The two main factors to keep in mind are water resistance and adhesive strength. If the piece is meant for outdoor use or exposure to moisture, opt for a waterproof or water-resistant glue. For repairs on structural elements, such as chair legs, prioritize strength when selecting an adhesive.

Carpenters' glue works for most repair needs—experiment to find the one that suits your style and delivers reliable results. In specific cases, choose the glue best suited for the particular repair.

Adhesive Options

Here is a list of various adhesives and guidelines on when to use them for furniture restoration tasks.

Polyvinyl Acetate Glue (White Glue)

This adhesive comes as a white liquid, typically packaged in a squeeze bottle with a nozzle for easy application.

Requires 18 to 24 hours to fully set and cure.

Clear, dry finish

Uses: Ideal for general repair tasks. Avoid using if the item will be exposed to moisture or water. Suitable for non-structural wood-to-wood bonding.

Aliphatic Resin Glue (Carpenter's Glue, Yellow Glue)

This adhesive is a yellow liquid, commonly available in a squeeze bottle with an applicator nozzle for ease of use.

Requires 12 to 18 hours to fully set and cure.

Dries to a clear, matte finish

Uses: Ideal for general, nonstructural woodwork in dry conditions; specifically formulated for wood. It has a quicker setting time and a slightly stronger bond compared to polyvinyl acetate.

Plastic Resin Glue

Comes in powder form, which must be mixed with water to achieve a creamy consistency. Available in cans.

Requires 18 to 24 hours to fully cure and set.

Dries to a clear finish, leaving a smooth surface

Uses: Provides a strong bond for structural elements. Requires a tight fit for proper setting. Water-resistant, but not suitable for outdoor use; may degrade in high heat or humid conditions.

Resorcinol Glue

A two-part adhesive, consisting of a liquid and a powder. Sold in cans.

Sets within 10 to 12 hours.

Dries to a brown finish, leaving a dry appearance

Uses: Offers a very strong, water-resistant bond. Suitable for both indoor and outdoor applications. Quite costly. Once mixed, it has a limited working time of three to four hours.

Hide Glue

Available in liquid form or as flakes that are mixed with water and heated.

Requires 24 hours to fully set.

Dries to an amber-brown finish

Uses: A classic choice for carpenters' glue. The liquid form is easier to apply. Provides a very strong bond, but should not be used in high humidity conditions.

Contact Cement

A light-colored liquid, available in bottles or metal containers.

Sets immediately upon contact; fully cures in 1 to 2 days.

Dries clear

Uses: Ideal for applying to veneers. Not suitable for wood joints. Highly flammable and costly.

Epoxy

Consists of two components, resin and hardener, mixed into a thick liquid. Available in tubes or cans.

Setting time ranges from 5 minutes to 24 hours.

Clear amber appearance once dry

Uses: Provides an exceptionally strong bond; ideal for attaching metal to wood. Highly expensive. Must be applied promptly after mixing.

Painter's tape, disposable paintbrushes, and similar materials, although not often used, are essential in a workshop. Let's take a look at their various applications in the next section.

Workshop Materials: Painter's Tape, Oils, Cloths, Rope

While paint and varnish removers, abrasives, and adhesives are the most commonly used materials in furniture refinishing and repair, there are other essential materials that, though used less frequently, should be kept on hand for when the need arises.

Painter's Tape or Blue Tape. This tape is perfect for creating sharp lines when applying finishes. It's also helpful for clamping irregular glue joints. It's a good idea to purchase two sizes: 1/2 inch wide and 1-1/2 inches wide.

Throwaway Paintbrushes. Inexpensive paintbrushes are available for quick use and disposal. Though it may seem wasteful, the cost of cleaning brushes with thinner, mineral spirits, or other solvents often exceeds the price of the brush. Don't forget to account for your time spent on cleaning.

Use disposable brushes for applying base finishes and stains, but avoid them for top coats and final finishes. Invest in more expensive bristle brushes for applying top finishes, buying them as needed.

Paste Wax. Hard wax is ideal for most furniture refinishing tasks. Available in various wood-tone shades, it's a good idea to stock a neutral wax in your shop and then purchase specialty colored waxes as needed for specific projects.

Black Wire. You'll frequently use fine black wire for a variety of tasks, such as rewiring furniture springs or securing splits in wooden pieces. A 25-foot roll of single-strand black steel wire should be more than enough for most jobs.

Linseed Oil. Oils are commonly used in finishing. Since linseed oil can spoil in the container over time, it's best to buy a pint or quart initially and then replenish as necessary.

Mineral Oil. Ideal for mixing pigments in furniture refinishing. Start with a small bottle and purchase more as your refinishing needs increase.

Turpentine. A quart of turpentine is typically sufficient. It's used for cleaning up after finishing and for thinning certain solvent-based finishes.

Mineral Spirits. This is used for cleaning wood, finishing cleanup, and thinning solvent-based finishes. A quart should be plenty for your needs.

Denatured Alcohol. A quart should be more than enough to keep in stock. It's useful for removing or testing shellac finishes, as well as for thinning shellac to apply as a sealer and finish.

Lacquer Thinner. Ideal for stripping lacquer finishes and for general cleanup. Keeping a quart on hand will suffice for most tasks.

Wood Fillers. These include wood plastic, water putty, shellac sticks, putty sticks, colored wax scratch-mending sticks, and spackling compound. It’s wise to keep a small can of neutral wood filler on hand, but it tends to dry out quickly. Purchase wood-tone fillers as necessary for matching purposes, and if the right color is not available, you can mix in a small amount of stain. Wood filler is not designed for structural strength, so be sure to clean the surface with mineral spirits before applying it.

Water putty comes as a powder that you mix with water to form a thick paste. Once it sets, it hardens like stone and can be shaped with cutting and smoothing tools.

Shellac sticks, putty sticks, and wax scratch-mending sticks are offered in a range of colors. Buy them as required for your projects. While you might not need spackling compound, it’s inexpensive and remains usable indefinitely in powder form, so it’s handy to have for filling rough edges on unfinished furniture.

Clean Cloths, Towels, and Sponges. These are essential supplies for all refinishing tasks. Be sure to have a good supply on hand for the work ahead.

Tack Cloths. A tack cloth is frequently used during wood refinishing to wipe down the surface right before applying the finish. You can either purchase ready-made tack cloths from paint supply stores or make your own.

To create your own tack cloth, start by laundering a white cotton dish towel. A size of about 12x24 inches is ideal, though it’s not essential. Soak the towel in clean water and wring it out as dry as possible, then fold it several times to form a pad.

Next, pour a few ounces of turpentine onto the folded cloth and work it in with your hands until the turpentine is well absorbed, ensuring the cloth is merely damp, not soaking. Then, pour a few ounces of varnish over the turpentine-moistened cloth and knead it thoroughly to distribute the varnish evenly. This process requires some patience, so don't rush it. When finished, the cloth should feel tacky to the touch, not wet or damp.

Tack cloths can dry out over time as you use them. To restore their tackiness, add a few drops of turpentine and varnish. Store tack cloths in sealed jars or plastic bags to keep them from drying out. To use, simply wipe the tack cloth across the surface you intend to clean before applying the finish.

Bleaches. You can use standard laundry bleach to eliminate old stains or fillers. For tougher tasks, such as removing black watermarks, opt for oxalic acid crystals or powder. Oxalic acid may not be easy to find everywhere, but if you do come across it, it's a good idea to stock up on a few boxes. If you need to lighten the natural color of wood, a commercial two-part wood bleach is required—it’s pricey, but no other bleach will do the job as effectively.

Aluminum Foil. Aluminum foil has a variety of uses, such as keeping strippers from drying out.

Rope, String, Toothpicks, etc. Purchasing these items in bulk will ensure you always have them on hand for a range of tasks.

Wood. When replacing parts in furniture, you can use any piece of wood that's appropriate in size and type, such as an old table leaf, a birch dowel, a broom handle, or a hickory or ash tool handle. Don't throw away old wood with a nice patina or even small scraps of hardwood; these can come in handy for making glue blocks and braces.

Many materials offer valuable uses in furniture restoration and repairs, so be sure to keep them on your must-have list for your workshop.

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