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Dream Burls
03-17-2013, 10:15 AM
I have a large wooden box on my back deck that I built to house cushions and the like. The top is in two sections made out of plywood about 3' x4' each, both attached with a piano hinge so they act as doors. I had finished them with a number of coats of polyurethane, but it keeps peeling off during the winter. Any suggestion on what I can finish this with that will provide protection and that will stay affective? Thanks.

PierreRodrigue
03-17-2013, 10:23 AM
Marine grade spar finish. Heat and cold resistant, also filters UV light.

Dream Burls
03-17-2013, 11:03 AM
Thanks Pierre. If I can find it I'll pick some up.

Burl Source
03-17-2013, 04:06 PM
or...Thompson's Water Seal.
Poly sucks for outdoor use.
You are probably safe with most of the products that are formulated for decks.

Dream Burls
03-17-2013, 05:09 PM
Duh, why didn't I think of that? I even have some sitting in my closet. Thanks Mark.

The BoardSMITH
03-17-2013, 05:21 PM
Stay away from Thompsons Water Seal. It is nothing more than paraffin and mineral spirits. Sand the surface to get rid of as much of the polyurethane as you can then coat with spar varnish. Polyurethane is to rigid and spar varnish has tung oil added, along with UV inhibitors, to make it more elastic with changes in temperature and humidity and suitable for outdoor use.

Deck finishes will work but unbtil you get rid of the polyurethane, nothing will penetrate as needed.

Dream Burls
03-17-2013, 05:30 PM
I figured that the poly had to go before I applied anything. This is great info, thanks.