I absolutely loved the systems three silver tip two part epoxy primer. Good above or below the waterline, good build up, thins and cleans up with water and dries quickly. I applied mine with a foam roller and did multiple coats in one warm day, then let it cure for a few days before topping with traditional oil based marine enamel below the waterline and systems three LPU above the waterline. Five year later I would do the same again.