Prepare all surfaces
I'm the builder Gil referred to in the previous post. If bondo is required to repair surface irregularities, make sure the surface BELOW the bondo is properly prepared so there is no adhesion problem later on.
Bondo is a brand name for a low cost product. I use RAGE and have had good results.
I used the Sherwin Williams aviation paint system which begins with acid etch, moves onto etching primer, then a surfacer/sealer, followed by their Genesis fleet top coat and am pleased with the result. I have no idea how well it will stand the test of time but it went on easily. I doubt it's as tough as Imron but I banged it installing the vert stab after only 12 hours of curing and the paint did not chip. Talk about a pucker moment..... but I was thankful to the paint gods for good products.
If you must use an aerosol can, know that you can buy refillable aerosol cans, fill them with the correct Dupont primer to suit Imron, and then pressurize the can using your compressor.
Know that you will have to sand the primer again before final priming and paint to promote adhesion.
Barry