Did you use the rubber eraser discs attached to a drill like the body shops use to remove decals?
They are available on Amazon: HXXF Car Decal and Sticker Remover Tool Rubber Eraser Wheel with Drill Adapter Kit for Removing Vinyl, Pinstripes, Stickers,2Pack for about $20.
I'd guess the same kind of paint used to paint a car .. like a Corvette that is all fiberglass. Any body shop can assist in the determination.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.