Unless its in a wet slip I would not paint it. Mine was already painted with what was probably a tar brush and I had to do something so I got off as much of the old ugly faded anti foul as I could and put a couple of coats of nice dark gray porch paint on the bottom and a red stripe over it which looks good and covered well. Its your boat and you will do what you want but why bottom paint a trailer boat? I think they look a lot better with out it. Frank