Il pop up some pictures later if I get time but I'm after some advice as to how I got it wrong. I painted my bonnet last summer, first time using a gun an compressor. Using 1k paint. I keyed the original paint to the primer then applied a layer of primer from a can, then the colour then two coats of clear. After some wet sanding I was really happy. Few minor things like a fly and I over sanded one corner. First few weeks were great. Then winter came. The paint was suddenly ruined. The car lives under a cover. The two defects are tiny blisters, I believe these are called micro blisters and are caused by water in paint? This is only in one area. The second defect which is throughout the panel is cracking. The paint looks like it's shrunk and split apart. I assume this is some sort of reaction?

So before I try again, what went wrong?

It's odd that it happens to certain panels and not others. Really puts me off using 1k again.

You may want to see this -

 

http://www.hotrod.com/how-to/paint-body/0901sr-help-with-troubleshooting-paint-problems/

 

I think the problem is Checking or Crazing, which pretty much comes down to applying too much paint before the coat beneath is dry. For me, I'm pretty sure it's only affecting the clear coat.

 

It has spread to more panels....not great.

 

apparently it can affect 1k and 2k alike.

Right. That's kinda what I'd worked out from what Russ said. I'm going to switch to a LPLV gun and have one more go. If that fails then il pay over winter.