Reply by Planeman40

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Posted on Lacquer problem / White film on finish?

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1523 posts in 3677 days

#1 posted 12-04-2018 04:50 PM

What you are most likely dealing with is what is called “blushing” which is common to lacquer. What happens is the fast evaporation of the thinner in the lacquer chills the wet surface causing water vapor in the air to condense on the surface turning the lacquer surface a milky white.

There is a cure. Lightly brush a DAMP brush dipped in lacquer thinner on the surface. Handled carefully, this slightly melts the surface of the lacquer. The trick is to do this so there is just barely enough thinner to melt the surface and then flash off so quickly that the surface can’t chill enough to allow condensation to form.

I learned this more than 60 years ago when, as a boy, I built tissue covered model airplanes using nitrate dope, a type of lacquer. I live in Atlanta, Ga. where the summer temperatures are high and the humidity is wringing wet!

Also, Try lowering the the temperature in the shop. The higher the temperature, the more moisture the air will hold. I suggest applying lacquer at around 70 degrees (F) or lower

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