Paint crazing ?

[Jon Haigwood]

I rattle can sprayed some enamel orange paint on a body yesterday (about 3 coats). Today I noticed that one side needed another coat and sprayed another coat of the same paint on the side. Just checked it and it crazed What would make the same paint craze applying another coat ?

[StevenGuthmiller]

If it was enamel paint, it most likely would not be crazing.

Crazing is when the paint is too hot & attacks the plastic itself, usually with lacquers.

What you have is more likely "lifting" which is a reaction between layers of paint.

Not exactly sure what the cause is or how to fix it.

 

Steve

[Jon Haigwood]

this  

[Art Anderson]

Joe, you don't say what brand of "enamel" paint you used on this, or whether or not you sprayed that over another coat of paint, but that's what it appears to be.    All enamel paints are not created equal--many brands sold as consumer rather than hobby products can have solvents that are "hotter" than say, Testors, and can cause this every problem if used over Testors.

Art

 

[Kit Basher]

I think the problem is that the first three coats were not cured. If you put those coats on in rapid succession, you would have a thick layer of paint with a dry skin, but still soft underneath. When you sprayed one coat the next day, it was thin and dried quickly. As it dried, it shrank, and moved the paint underneath, causing those ridges. The good news is you don't have to strip it. If you wait until all the paint is fully cured, you can sand down the ridges, and add one more coat to cover.

Edit: After looking at the photo again, you may have to strip it. It looks like there are a couple of blisters. Those may have pulled the paint up all the way down to the primer. If you can wait until the paint cures, it's still worth a try sanding it. If you don't want to wait, strip it.

Edited May 25, 2016 by Kit Basher

[Jon Haigwood]

The paint was cheap of name brand and I think Kit Basher maybe right with the first coats not being fully dried

I normally paint with acrylics and heat cure between coats.  

[StevenGuthmiller]

The good news is, that is "lifting" not "crazing", so the plastic is undamaged.

Bad news is, Hugh is right.

I see some blistering, so I'm afraid a stripping is in your future.

More good news. Enamel is very easy to strip.

So look at the bright side.

You have more good news than bad.

 

Steve

[935k3]

This is why Krylon and allot of non-lacquer paints have a re-coat window. On of the reasons I do not use them on bodies. The recommended windows are not fool proof.

[Jon Haigwood]

Thanks for the replies. Since most of the damaged surfaces were flat I was able to sand and re-primer then re-paint that side. All is well.

Now that I know the cause I can avoid it in the future

[Kit Basher]

I'm glad it worked out, Jon.