Glass composite plywood Boatbuilding defined - the art/drudgery of sandings for days in a row, sanding sanding and more sanding. Is it smooth enough yet? What else is there to sand? The bottoms of H1 and H2 are now faired and sanded. Quick get some primer on to stop the sanding but wait I'll be sanding the primer too before I paint. Oh good that means I get to sand more. No pictures today all I did for six hours was sand. I hate sanding!