How do you glue these back on?

I think what helps is i was into model making as a kid, specifically scratchbuilding different kits that werent available, plus doing autobody as a hobby since i was 15. The surrounds will get sprayed w dupont sandable laquer primer. Yes it does eat plastic, however if sprayed in very fine coats letting it dry between coats it will etch into the plastic nicely without cracking or crazing. This makes a nice base to sand smooth and apply topcoat to. I will leave them in primer and let my son decide on black or silver.