> I recently spray painted some parts with XO-rust paint (Rustoleum knock
> off) from my local Tru-Value hardware store. The paint has worked fine in the
> past, but on one of my parts the paint would crinkle up in certain places. The
> part was bead blasted and wiped down with lacquer thinner before painting. I
> then waited and painted when it was about 60 degrees F and the can said it has
> to be at least 50 degrees F. I gave it a first coat and then a second coat the
> next day. I tried recoating within an hour. I tried thicker coats and thinner
> coats I tried several variations on how to paint it, but would always get some
> crinkles. Any ideas what causes this?
The usual cause is "paint applied too thick". I suspect this applies to the
total thickness when recoated within an hour. You might try applying only one
(thin) coat to that area, or possibly just letting the first coat dry thoroughly
(which probably means a week or a heat lamp in this weather) before applying the
(thin) second coat.
Although I doubt it's your problem, note that lacquer thinner will not remove
all forms of surface contamination, especially silicone (like from DOT 5 brake
fluid). There are purpose-made solvents that will, I like Acryli-Clean (can't
remember offhand whether it's from DuPont or PPG). I also find that heating the
surface with a propane torch after cleaning (not hot enough to damage it) helps
paint adhesion on old LBC parts. Not sure why, maybe it just drives all the
solvent out of the surface pores or something, but it does make a difference
IMO.
Randall
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