forget about using interlux products...in event of a failure, they won't stand behind their coatings.....try using us paints (awlgrip) 545 primer...it is a two part mix (50/50) rolls and tips wonderfully, and sands like a dream...it is an epoxy primer....the grey for some reason brushes out better than the white, but the nice thing about the grey is that when you sand it, it goes to a lighter shade and allows you to easily see and sand out brush or roller marks....the barrier coat , which some guys used on a 53 cold bolded sportfish, as a primer had a tendancy to load the sandpaper pretty bad...