Bottom Paint
I agree that info from PO best to eliminate guessing.Otherwise, especially if your boat has been in fresh water, I would guess that you have a vynal type of paint. I use VC-17 and it gets polished by lifting straps etc. and will show thru the oxydized surface layer.If it is vynal and you have thin areas they will show gelcoat, tar (black), or a primer if used. When you open a can of vynal, you will have to mix powdered copper into the paint prior to application. This will turn the paint to a copper color. Depending on whether you are in or out of the water, the bottom will oxydize to its intended color within a few weeks. As opposed to ablative type of paint, vynal is very viscous and requires a short nap roller resulting in a very thin layer of paint.I would not paint other than to retouch any imperfections if my hull otherwise looked even and well covered.Hope this helps.