Now with a few things piled on it gets harder and harder to give any advice on your specific job. Generally speaking the substrate that is wrinkling is too thin, or not properly catalyzed or something like that. The solvent from what you spray on it is kicking it's butt. Why is it doing this, because it isn't a "barrier", it isn't blocking the solvents from getting thru it. At this point only you can tell what you can do to change this.
The truck is looking AWESOME if that counts for anything.