Repairing Water Damaged Wood

Repairing water damaged wood can be a tricky proposition. The first step is to identify the source of the moisture and take steps to correct it. Otherwise, you’ll just be treating the symptoms rather than the cause of the problem.

Once the source of the moisture has been addressed, you can begin to repair the water damage. If the wood is only slightly water damaged, you may be able to sand and refinish it.

However, if the damage is more extensive, you may need to replace the affected boards entirely. In either case, it’s important to take action as soon as possible to prevent further damage from occurring. With a little effort, you can make your water damaged wood look like new again.

Work wonders on wood with oxalic acid.

Watering a potted plant can be disastrous if the plant lives on top of something wooden. We’ve all seen the white spots and black rings that can result when water seeps through the pot. And if you’ve ever tried to smooth these marks, you know it’s hard work that can leave telltale depressions on the surface. Fortunately, in many cases, this type of damage can be almost magically repaired by treating the surface of the wood with oxalic acid.

Repairing Water Damaged Wood
Repairing Water Damaged Wood

Oxalic acid removes the gray color from oxidized wood, without altering the natural color of the wood. That’s why it’s commonly used as an active ingredient in deck cleaners and why restorers use it to remove gray or black water stains on furniture (see “Oxalic Acid Cancels Rust,” below). Oxalic acid is also used in some household cleaning products to remove hard water stains and has many industrial uses as well. Although found as a natural ingredient in some vegetables (spinach and rhubarb), oxalic acid is quite toxic when ingested in concentrated form.

Identify the spots

Each final repair job is obviously unique, so the first step is to thoroughly investigate the problem. The thoracic eyelid shown here has both whitish markings (also called redness or bloom), as well as dark gray and black discoloration. The white marks are usually in the finish; the dark discolorations of the water indicate more significant damage, because they are in the woods.

White Spirit

To help formulate a plan to repair this finish, I moistened the entire lid with white spirit (paint thinner). This test method is useful whenever you want to closely examine old dry finish or bare wood. The appearance of the surface moistened with thinner is similar to what it would be if shellac or a clear oil-based finish were applied.

In this case, wetting the surface, the whitish spots temporarily disappear (reappear when the white spirit evaporates). This means that one or two coats of finish are all that is needed to take care of the white marks. (This is a fluke; if the white marks were not gone, additional repair steps would be required to remove them, and that’s a topic for another story.)

Now I can focus on the black rings. The mineral spirits test shows that they get darker and this makes them good candidates for oxalic acid treatment. If oxalic acid works, I won’t have to aggressively sand the entire lid. Sanding would not only remove the remaining intact finish (80%, in this case), it would also lighten the aged cherry color of the lid, so it would no longer match the rest of the case it belongs to.

Treat stains

Repairing Water Damaged Wood

1. Start by cleaning the surface thoroughly. First, clean it with mineral spirits to remove nail polish and other greasy or waxy impurities. White spirit also shows how damaged areas will look with a clear finish applied.

Each step of this treatment should be done consistently across the entire surface, not just the damaged area. The procedure involves flooding the surface with water. Fortunately, the damage shown here is on solid wood – using this treatment on a veneered surface can be risky.

Repairing Water Damaged Wood

2. When the white spirit has evaporated, complete the cleaning process by wiping the surface with soap and water, using a soft cloth, to remove any water-soluble residue. Allow the surface to dry completely.

The first step is thorough cleaning, using two different cleaners. White spirit removes greasy residues, such as old wax or polish (Photo 1). Delicate dish soap and water remove any water-soluble grit (Photo 2). None of these processes will damage an intact finish.

Repairing Water Damaged Wood

3. Sand lightly, using fine paper, a soft block and minimal pressure. Although the goal is to remove the raised grain from the damaged area, it is important to sand the entire surface to maintain consistency.

The grit is slightly raised in the water damaged area, so a little sanding with 400 grit paper is required (Photo 3). This step should take about a minute.

Repairing Water Damaged Wood

4. Mix a saturated oxalic acid solution in a non-metallic container. Add one tablespoon at a time to the water and mix, until a layer of undissolved oxalic acid remains on the bottom.

Mix a saturated solution of oxalic acid by adding the crystals to a jar of warm water with a plastic spoon (Photo 4). Do not use metal containers or utensils: the acid may react with the metal. Add the crystals one tablespoon at a time and mix until they no longer dissolve in the water. I always use a saturated solution, so that I have a problem solver with maximum strength.

Repairing Water Damaged Wood

5. Rub on the oxalic acid solution. Leave it on the surface for about five minutes for maximum effect. Then remove the excess and let the surface dry well. The effect can be almost instant.

Wearing gloves and eye protection, use a rag or sponge to saturate the entire surface to be treated, not just the dark spots (Photo 5). Keep the surface wet for about five minutes for maximum effect. Then remove the excess and allow the surface to dry completely. You may see the effect immediately as you apply the acid, or the stains may gradually disappear as the acid dries. If a second application of acid is required, wait to apply it until the first application has completely dried, otherwise it will not work. If two or three applications don’t completely remove the stain, more acid is unlikely to help. You will have to live with the remaining discoloration or resort to sanding to remove it. However, do not sand before thoroughly rinsing the surface: breathing dust that contains oxalic acid is extremely unpleasant and potentially dangerous.

Repairing Water Damaged Wood

6. Repeatedly flood the surface with water to remove any residual oxalic acid.

After the oxalic applications, it is essential to rinse the treated surface thoroughly with plenty of clean water, to eliminate any acid left on the wood (Photo 6). Wet the surface several times and dry it each time with a clean cloth or paper towel. Let the surface dry between each flood.

Attempting to “neutralize” the acid that remains on the surface with a mild alkali such as baking soda, borax or ammonia is a cleaning option often cited as an alternative to rinsing. However, I have never seen accurate formulas that would make this chemical balance a practical possibility. Also, I know that thorough rinsing works.

Repairing Water Damaged Wood

Moisten the surface with white spirit to test the results. Here, the whitish reddened areas virtually disappear and the black marks have disappeared to 99.9%. The repair is complete; it’s time to rebuild the finish line.

After the lid has completely dried, wear a respirator and lightly sand the entire surface with 400 grit paper to remove any grains raised by oxalic treatments. Test the surface again with mineral spirits to evaluate the results (Photo 7). The test on this lid indicates that the surface is ready for finishing (Photo 8).

Repairing Water Damaged Wood

In this case the finish is blonde shellac, the same finish as the original. Adding a waterproof finish to shellac could help prevent future damage. Moving the plant might be a better option.

Wood furniture

Repairing water damaged wood furniture can be a challenging task. The first step is to identify the extent of the damage. If the wood is only slightly warped or discolored, it may be possible to salvage the piece with a little effort. However, if the damage is more severe, it may be necessary to replace some or all of the affected boards.

Once the extent of the damage has been assessed, the next step is to remove any wet or damaged wood. This may require the use of a saw or other power tools. Once all of the wet or damaged wood has been removed, the remaining pieces can be sanded down and refinished.

With a little patience and effort, it is often possible to repair water damaged wood furniture and restore it to its former glory.

Wooden furniture

There are many reasons why wooden furniture is a great choice for your home. First of all, it is very strong and durable, so you can be confident that it will last for many years.

Secondly, it is very easy to care for and maintain, so you won’t have to spend a lot of time and effort keeping it looking its best.

And finally, wooden furniture has a warm and natural appearance that can really add to the overall ambience of your home. So if you’re looking for furniture that will be both stylish and long-lasting, wooden furniture is definitely worth considering.

Wood furniture cleaner

Furniture made of wood is an elegant and timeless addition to any home. Although wood furniture is durable, it require regular cleaning and maintenance to keep it looking its best. One way to clean wood furniture is to use a vinegar solution.

To make this cleaner, mix equal parts water and vinegar in a spray bottle. Then, simply spray the solution on the surface of the furniture and wipe it clean with a soft cloth. For best results, be sure to test the cleaner on an inconspicuous area of the furniture first.

In addition, avoid using this cleaner on delicate finishes or painted surfaces. With proper care and cleaning, your wood furniture will continue to look beautiful for many years to come.

Wood furniture insurance company

At Wood Furniture Insurance Company, we understand the value of your wood furniture. That’s why we offer comprehensive protection plans to help you keep your furniture looking its best for years to come. Our protection plans cover accidental damage, such as stains and scratches, as well as wear and tear from normal use.

We also offer coverage for repairs and replacement, so you can rest assured that your furniture is always protected. Contact us today to learn more about our protection plans and how we can help you safeguard your investment.


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