Q: Can I put one coat of oil based polyurethane on some drawers, wait eight hours or so, and then overcoat the oil based polyurethane with several topcoats of waterbased polyurethane? A: Sometimes. That is to say, some waterbased polyurethanes will adhere to some oil based polyurethanes, but not all will do so. I’d let [...]
Q: I’ve been using cellulose sanding sealer on my woodturnings. What’s the difference between it and Zinsser SealCoat, and which is better? I normally use wipe on polyurethane as my finish. A: Better is a personal judgment you must make, but I can certainly tell you the differences. Cellulose sanding sealer is lacquer laced with [...]
Q: I want to make jewelry out of glued twigs and have it be durable. I need to glue the shape together with PVA glue and then coat the entire piece with a sealer. I have read about cyanoacrylate and epoxy resin. Any advice? A: There are a wealth of good sealers that will work [...]
Q: I am chemically sensitive and am renting a house where some perfume has embedded itself into the wood doors of a closet. I am looking for a clear sealer with no vocs and no fungicides or harsh chemicals to use to seal the odor in. A: The very best odor sealer is shellac or [...]
Q: I turned Christmas ornaments of cherry wood. On one small spot about the size of a quarter, I can not get lacquer to stick to the wood. I did not get glue or oil of any kind on the wood. I used acetone to wipe down the ornament before I started spraying. A: That [...]
Q: I just bought a house and the previous owner never cleaned the oil off the cabinet doors near the cook top. I had the grease cleaned off but the finish appears etched, like you can still see the drip marks and spots. Is it possible to put glaze over a satin poly finish without [...]
Q: Is shellac sanding sealer appropriate under aerosol cans of paint? A: That depends on what you mean by shellac sanding sealer, and where the item will be used. Cans of liquid shellac typically have wax in them, which occurs naturally in shellac, and are not appropriate under some finishes. Zinsser SealCoat, which is actually [...]
Q: I just had one paint store employee tell me shellac is comfortable for old timers, but is not the best sealing product for sealing wood. A: That depends on whether we are talking about dewaxed shellac or shellac with the wax still in it. Shellac with wax in it, which is what is in [...]
Q: I have a copy of your New Wood Finishing Book, but wood conditioner isn’t mentioned in the sealer and primer section. A: That’s because it is not sealer or primer. Wood conditioner is colorless stain, and is therefore mentioned in the stain section. Wood conditioner has all the other components of stain (solvent and [...]
Q: I’ve heard applying a wash coat of shellac underneath water based dye can reduce blotching on hard maple. Would you recommend this? A: No, for a lot of reasons, but we really need to start by cleaning up the terminology, since in this field, it is very specific. I think you mean water soluble dye, [...]
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