Is sanding between coats required when applying Pettit Hydrocoat? Eric Boudreau April 13, 2021 14:56 Updated There is no requirement to sand between coats when applying Pettit Hydrocoat. There is also no time limitation, beyond the minimum overcoat time that the product specifies. Related articles Can I apply bottom paint on bare fiberglass? Which bottom paint is right for my boat? Common reasons for antifouling paint failure Top bottom paint FAQs Do I need to apply a primer over gelcoat before applying antifouling bottom paint? Comments 0 comments Please sign in to leave a comment.