I have decided that the inside needs paint, not varnish. It is just not good enough for a clear finish. i have applied firts a grey primer, then a second coat of mixed primer and top coat. Only after I applied that did I wonder if the two paints are compatible. They are from differnt manufacturers, so I hope I don't end up with a layer that never sets! The final top coats will be off white and then varnish for the deck and gunwales. I want to fix a rope fender around the edge so that it doesn't damage Daisy G each time she bumps into her.