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One other point. Most 2 part paints use very dangerous solvents. People have died or suffered permanent nerve damage using them in enclosed places. You must use "supplied air" breathing gear when using 2 part paints.
Of course even one part paints have dangerouse fumes which must be dealt with, but 2 part are much worse.
I painted all my spaces with simple Krylon spray can paint starting in 1983, and have had no problem with peeling. Proper surface preparation is the critical thing for such areas, as they put low demand on the paint itself.
Clean all unpainted fiberglass with a wax removing agent. If you have plenty of air circulation, you might use Interlux 202. Acetone is lots cheaper, and will work, but it is much more explosive and evaporates so fast, it is difficult to get it wiped off before it dries, leaving the contamination right where it started. One process I've used a lot is to first wipe down with paint thinner, until a white rag comes away white. The paint thinner leaves its own film. then remove this film with a quick wipe down with 202.
Soap and water can do it too, but is much more difficult, though safer. Fantastic will cut the wax, but must be thoroughly rinsed off.
If the area has been previously painted, remove all visible dirt, and wipe with 202. After cleaning, a light sanding with 100 grit, and another quick wipe down with 202. Be aware that 202 is not good to breathe either, and is flammable so good ventilation is a must.