I have a client (an association we regularly clean gutters for) who just had all 100 or so of their decks replaced. They are wanting to take better care of them this time but are insisting on a clear wood finish over a stain. I'm a big fan of Ready Seal but color is a tough sell for these folks. What is the best clear wood finish that can be applied in one coat and won't build film over the years of repeat application? They are expecting to have this done every 2 years or even more frequently so durability isn't a huge issue, I just don't want to have to strip before future applications.