wodniw5
My approach was to use the varnish that is made to be outside in the weather. Known as Marine Spar Varnish, this is the stuff they put on wooden boats. Creates a very hard & durable finish.
6 to 8 coats is what the boatbuilders put on them.
Not sure how poly would hold up over the years compared to Spar?
Just a thought. Anyone else ever use Spar Varnish finish?