Well, the paint was Deltron with Deltron 4000 clear. I don't consider it crap but I am not an expert.
The filler was applied on bare metal but was feathered very lightly onto the existing paint but not on much if any clear coat. However, there was absolutely no lifting or wrinkling where the filler was. In fact the repair turned out perfectly.
I went to the paint shop today and they thought it was because I sanded the clear too thin or through and then the Epoxy Sealer reacted with the base color and also where the clear was too thin (less than 1 mil). They advised me to use K36 as a primer. Sand that to 600 wet then apply base and clear. I also put on a wet coat of primer which probably should have been laid down dusted for a couple coats and probably should have waited for the clear solvents to evaporate or escape. Can't remember what you call that right now. Then after the dusted coats I could go wetter.