i decided to paint the deck with Interdeck by International, and i`d like to know your expiriences with this paint. since our deck has many layers of unknown paints, we`d decided to sand all off to gelcoat. do we have to prime it with Perfection Undercoat or can we just paint the gelcoat directly with Interdeck? is it suitable for cockpit area as well? can i paint the whole deck or do i have to make those "anti-slip patterns"? and how are those patterns made, with a sponge?