I found that when people do a cheesy paint
job, they generally use cheesy paint
as well. The good news for me has been that something inexpensive and doesn`t seem to damage FRP like lacquer thinner will "boil" or lift crappy enamel type paint
. You could try spraying or pouring it on to see and it would act as a stripper. If the paint is high quality, such as a good base coat/clearcoat like they use in modern automotive, it will not lift so easily and may be a good substrate to start with in the first place.
Be careful with a hot air gun as overheating polyester resin can actually re soften it even though it is a catylized thermoset. You could also inadvertently scorch the ensolite and it may let go (seems like it is only contact cemented in place.)
I personally don`t like using strippers on any plastics as I found it hard to clean/neutralize after.
I would avoid doing any unnecessary finish work you can or you may find yourself spending more time sanding than camping..
Good luck with with it.