I'm shortening the pod on my jet boat, and I've got a question regarding the prep work required between coats. I'm using some "Boater's Resin" from West Marine, which is a waxed resin. I understand that I have to sand between coats. I'll probably be doing 2 layers on each side of the material. Is grinding 100% of the surface absolutely necessary, or will a wipe down with acetone dissolve remove the wax from the surface as well? I'm just concerned about some of the corners that are hard to get to and will not be finished and painted.