Griff,
You’re experiencing “lacquer Blush”, where your finish has a chalky or milky look.
This is caused by high humidity and quick drying solvent. If you’re spraying the paint, the fast drying solvents like acetone are called “carrier solvents”, because they mostly evaporate before the paint hit’s the surface. This rapid evaporation cools the paint and attracts moisture from a high humidity environment.
Your solution is to either wait for low humidity , or change your solvent to a slower drying formula.
Call your paint store and tell them you are looking for a slower drying lacquer thinner. They should have thinner available in temperature ranges such as 60 to 70, 70 to 85 and 85 and up or something similar.
If they act like you just arrived from Mars…ask them for some “lacquer retarder.” This is a concentrated slow solvent that you add to your existing fast drying solvent as a ‘cocktail solution’ to slow down the evaporation.
If the guy at your paint store thinks you’ re looking for the short bus…cal your local automotive paint supplier.
Your duPont store should have either a gallon of “3661 lacquer thinner”. or a pint of “3696 retarder”.
I’ve sprayed a couple of hundred gallons of clear lacquer on walnut custom van furniture and trim work using 3661 as my preferred solvent with excellent results.
Hope this helps, but if you need more help let me know, I’ll give you my cel phone to walk you through it.
Q
p.S. Edit.
My preferred application method for finishing is duPont automotive grade “380 s” clear mixed 1 1/2 paint to 1 part 3661 medium thinner applied through a pressure pot, or 1 to 1 using other spray equipment.
-- I don't make sawdust...I produce vast quantities of "Micro Mulch."