OK, working on painting my manifold cover. I washed and dried the original paint. Scuffed it lightly, then primed it with a primer for plastic. After that dried, I lightly sanded the primer with 1000-grit. Cleaned the surface with plain water, clean rag, then blew it off with compressed air.

Set the part in the box, shook the hell out of my new can of DupliColor, and began spraying. This happened INSTANTLY.



So, what happened, and why? Also, what can I do to fix it?

HEEEEEELP!!!

 

Crinkling is a sign of incompatibility of paints/materials. It can also happen if the lower layers are not fully dried before coating. Anything that is used as a wash can soak in and cause problems later. Drying is crucial any time primer is coated because the primer is like a sponge. Others will have other opinions
In this case, I would sand off the crinkles tnrn bake iit at 200degF. Cooli li and very lightly dust it wit primer,Bake again at 200degF Finally dust it lightly with blue and bake it

 

Hey, thanks for the response! I suspect it's an incompatibility issue between the primer and paint, and I may have rushed a bit. The primer was dry, but I think I sprayed it on too thick, so it may have still been damp underneath.

This is a plastic part, so baking won't work. I used lacquer thinner, and stripped it back to bare plastic. It made a mess, but cleaned up perfectly.

Tomorrow, I'll go get the DupliColor primer, and test on something. See if I can get it to work.

Again, thanks for your input! I appreciate it!

 

yep......probably enamel and acrylic or something like that

 

What temp was when you were spraying it?

 

Oh, I'd have to say mid-60's, and dry. I considered it was too cold, but I suspect it was an incompatible mix.

 

mid-60 is fine. I asked because I had similar issue when I was painting dash of my 68 in my garage during winter, not a smart idea

 

I agree with Buster: it's an incompatibility between enamel and acrylic

 

I had this happen to me it was because from incompatibility.

 

Thanks fellas! I got everything stripped down and cleaned. I've sprayed the cover with the matching DupliColor primer. I plan on letting it sit for a few days to cure, then lightly sanding and trying the paint again. This mess has been a learning experience, for sure. It never occurred to me that paints would chemically react like that.