Originally Posted by
Naughty Nigel
A tin of black gelcoat doesn't cost much more than a tin of black paint.
Gelcoat can be applied by brush or spray. Once applied and cured it would need to be sanded smooth with progressively fine grades of wet-or-dry paper used wet, ending at 1,000 or 2,000 grit, and then polished smooth with T-Cut or similar.
With a bit of elbow grease it would be an easy DIY project, and wouldn't need to take long.