After filling a number of holes, I will be painting the transom on my 14ft fiberglass, but do I use a bottom paint because part of the transom will be under water, or will a topside paint do? The boat will be used in saltwater only on weekends in the summer and then on a trailer when not in use. I want something readily available that can be brushed or rolled on. Interlux comes to mind, but which paint type, Thanks