In the past the keels & external stems I've used have been varnished, and they were varnished all over. With my latest canoe they will be painted, and I'd like to paint them at the same time I paint the canvas. My question is: should the wood & canvas have at least one coat of paint on them before I install the stems & keel? or is it ok to use the bedding on bare wood & mudded canvas. O - both the stems & keel have been treated with linseed oil already.