I just repaired the transom on my bass boat from the inside, but there were some holes and chips on the outside skin that I had to fill. Looking for a grey paint for the back. It is gelcoat now, but I do not want to try and apply that much gelcoat area. I would just go ahead and use a topside paint, but maybe a couple times a year we go camping and the boat stays in the water/docked for up to 5 days at a time. I thought about interlux brightside (if it would last that long in the water?), perfection 2 part (will it last long enough for that much submersion?), and vc performance (but I need a light grey and it only comes in white). Looking to spray it on as thats what I have experience with.