OK, I'm finishing on the desk now and am wondering if I should take the advice offered to try using Varnish instead of the Polyurethane that I've used on the nightstands and bed that I refinished. First off - the only varnish I could find is Cabot Spar Varnish in satin. Now I'm confused by the label; ..."ultimate UV protection & marine durability Interior/Exterior formula". Should I even consider using this on a piece of furniture? (a desk) What is the difference between this and Poly? Should I brush it on the same way I've been brushing the poly? Is the varnish going to protect the top of the desk better than Poly? (I've used Poly on our dining room table and it has scratched a lot!) Can I apply the first coat & wait the 6 hours (dry to the touch per label) and apply the 2nd coat without sanding, then dry overnight, sand and apply 3rd coat? Thanks for any advice