My MIG has a Stitch and Spot weld selector. I had a terrible time getting it set right. Get one perfect 3 second weld and the next would blow through. Finally flattened a piece of 3/4" copper pipe and clamped it behind the weld area as a heat sink. That helped a lot.
Ran a DA over the epoxy to find the low spots:
Circled the trouble areas:
Here is my Disaster Area. Someone took a pick and performed what I call a "cave and pave" in the center of the hood. Used a hammer and dolly to flattened the tiny dents which caused a very large high spot. This will be a good place to learn how to use my new shrinking disc and slap hammer from Wray Schelin.