The Stovebolt Site Forums The Shop Area Paint and Body Shop primer bubbling

I am restoring a 56 stepside on a shoe string budget so I'm doing as much of the body work as I can,I am taking it totally apart sanding grinding etc, long story short the hood is totally smooth and ready to prime mostly down to bare metal I spray the primer on it sets up and when it is almost dry about 10 minutes it lifts and looks like that crackel finish paint.this only happens in the center of the top of the hood everything else is perfect

You really should spray your bare metal with an etch primer first that seals the steel from moisture.The etch primer actually etches into the steel.Then you can spray your 2 part primer ontop of that.As for the primer bubbling there must be something on the steel oil,silicone,ect just a thought

Wipe everything down with a metal prep or at least some paint thinner. If you have ever done mechanical work in the same shop as your paint shop, there's silicone in the air, on your tools, on your hands and clothes. A good grease and wax remover might help too.
Scott

Nothing like silicone or any "contaminants" are going to cause "lifting" which is what this is. It is caused by the solvents getting thru or under something like primer or paint, PERIOD. It happened on the top because this is where you applied the primer heavier.

Boy I feel like I should just tell you to go over and read the last post I made on the "rings appear after painting"

The thing is there was some thin paint or primer up there that is not a cured 2K product. It is soft, and soluable. When you applied the primer over it (top being applied wetter, human nature) it had more solvents in it that soaked into the soluable substrate and lifted it.

Check out the other thread for an article on "surface cleaners", don't use "thinner".