We are using Spar Urethane to finish the exterior and the floor of the gypsy wagon. It's "marine quality" polyurethane that supposedly will hold up to moisture and UV exposure well. After hemming and hawing about whether we should stain our reclaimed T&G before varnishing, we decided against it. Pine is hard to stain and it's an extra expense and time suck that we don't need. It's subtle in the picture, but the reclaimed wood has a nice golden color to it now. We have one more coat to do on the floor and 2 to go on the wall.