Hi Phil and welcome to the forum.
Get all the paint off first…stripper or sandpaper/whatever before making any decisions as you never know what is lurking underneath.
Almost anything is suitable for painting the hull. A layer of EzeKote might be prudent, or just a slightly thinner primer. I use Rustins primer/undercoat, water based, and this will take Halfords spray paint or anything else.
Ashley
Edited By ashley needham on 09/06/2021 14:21:43