I have oak hardwood flooring that extends onto my outdoor covered front porch. I have finally stripped of the multiple layers of paint and sanded it down. I want to lightly stain it and then finish it to show off the natural wood. It was suggested that I use marine spar varnish vs. regular flooring polyurethane. If this is the best finish, should I use a toner or conditioner before the varnish? If not, what else should I use?