Yes, I used primer between sanding frame and applying enamel. Everything was good and clean. I am thinking a thin layer of glue was left behind where I sanded off a decal. I used brake cleaner after removing other decals and there was no wrinkle. The last two decals, I was trying to leave on and decide to sand off at last minute. Didn't think to wipe with brake cleaner to remove any adhesive. It's clearly where the decals was, being the length and width that correlates to decal area. Sounds good. I'll see how everything looks after finally dried. I'll have to re-sand, clean and paint the two small areas where the decal adhesive wrinkled. Thanks, Doug