You know what. I just went out there and looked and it was a spot that was original paint and not sanded well. I hadent pulled the liner pieces off yet.
Now to the very small rust spots. The best way to describe them is it looks like tiny spot the size of a ball point pen. I just went and had a detailed look and it's almost like the coverage had small holes that left the primer bare.
I would like to know if I can brush the monsta on the raptor for the first coat to ensure proper coverage, then spray a coat on for texture?
Yes you can brush/roll over the Raptor and then spray a final coat. You just need to clean and scuff the Raptor first.
Regarding the problems you have now:
All coatings shrink as they cure. Any spots that were not sanded well could show the problem you describe with the cracked or lifting material.
The rusting spots sound like you did not get complete coverage and the pinholes allowed moisture to get through and start rusting.
This is one of the drawbacks of spraying vs rolling. Rolling forces the coating into the surface and ensures complete wetting of the surface and full coverage.
Your surface prep probably cut through the primer slightly to expose some bare metal which is rusting through the pinholes.
I need you to check something... When you pull off the piece that has lifted, you need to check the adhesion of the area right next to
that to see if the Raptor continues to peel up further from the problem spot. Work a knife under the edge and tell me what happens.
Don't go crazy, just lift at the edges. Is it stuck good or does it want to continue peeling?
Important: WHERE DID YOU USE THE ETCHING PRIMER? Over bare metal or over paint?