On fibreglass you could use an etching primer which is a modified alkyd primer that produces a sound base coat on wood, steel, fiberglass, aluminum surfaces. but you should use an ordinary primer before the top coat. Halfords do a spray etch primer.

I have used several Halfords Aerosol spray cans on boats over the recent years.

In each case I have sanded the hull down to bare wood as the boats were vintage ones and did have coats of paint on them that could not be identified.

Best to use thin applications of both primer then paint then build up on that after leaving 24 hours between each coat.

Another good point is that Halfords also stock plastic primer in their paints range which is ideal if your boat has a polystyrene hull or you have plastic fittings.

Boaty😎

Halfods spray cans will work brilliantly of if you know of someone who works in a body shop get them to spray it with 2 pak paint for you


Dave