Michael Dresdner

straight talk about wood finishing

Archive for the 'compatibility' Category

Spot on

Thursday, December 2nd, 2010

Q: Can no-sand floor renewal finish systems fill in worn spots on a baked on factory finish? A: Yes, they are made to go over any finish. However, the problem with worn spots is that they may or may not look the same. Many, but not all, finishes, both commercial and industrial, add amber to [...]

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Over toning lacquer

Thursday, November 11th, 2010

Q: I used a toning lacquer to color the wood. I want to put polyurethane over it. Can I do this? A: Yes, you can.

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Inked salad bowls

Friday, October 29th, 2010

Q: I want to color walnut sapwood on salad bowls with India ink, then seal it with shellac and salad bowl finish. Would this be safe for food? A: Yep. By the way, I would let the ink dry then go straight to salad bowl finish. In this case, adding shellac would weaken the finish.

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Auntie Oxidant

Friday, September 24th, 2010

Q: I made some replacement handgun grips of cocobolo. Realizing that cocobolo has a lot of natural oils in it I first sealed it with shellac, then filled the pores with a product called z-poxy. I then sanded and applied one coat of Minwax polyurethane. Three weeks later I can make a thumb print in [...]

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Wednesday, September 15th, 2010

Q: I am finishing alder with Daly’s Benite and CrystalFin, spraying with a Fuji gun and #55 needle. I have been using water damp cloths as tack rags. I am getting white spots in the dried finish. Most areas are fine, but some of the areas look like white overspray. The spots are down in [...]

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Compatibility

Thursday, September 2nd, 2010

Q: A friend told me that he used nitrocellulose sanding sealer on wood, and then finished it over with an automotive two part clear coat. Does this seem possible? To me it just sounds like the two different systems will not go together. A: You are correct in worrying about incompatible systems, but as luck [...]

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Acetone and the VOC question

Tuesday, August 31st, 2010

Q: I found some conflicting information on thinning nitrocellulose lacquer. Some very good finishers use straight acetone while others write of using lacquer thinner. I realize lacquer thinner is a soup so there are many possible formulations, but generally I was wondering how acetone might behave differently from thinner. A: Acetone, a ketone, is one [...]

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Glazy days of summer

Monday, August 30th, 2010

Q: I’ve stained and sealed with Zinsser SealCoat and plan to glaze with a Van Dyke oil-based glaze. I wanted to top with Zar Interior Polyurethane antique flat, but Zar says polyurethane will delaminate off either the glaze or SealCoat, which has no wax, but may contain stearates. Now what? A: First, SealCoat contains no [...]

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Epoxy over shellac

Friday, August 27th, 2010

Q: Can epoxy go over shellac? A: It depends on the epoxy. Most contain either alcohols or amines, either of which will bond to shellac, but because epoxy formulas can vary so widely, it would be best to either know more about the formulation you are using, or do a sample followed by a cross [...]

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Over pre-catalyzed

Saturday, August 21st, 2010

Q: Can you apply brushing lacquer over sprayed pre-catalyzed lacquer? A: That depends on the pre-catalyzed finish, and how long it has been cured. In some cases you can; in others you risk cracking and wrinkling. Because it is so risky without knowing a whole lot more about the particular coating involved than anyone outside [...]

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