The word around the yard here is that Concrete Sealers, such as H&C, are very good at protecting Bare Aluminum spars. Theses sealers are basically Acrylics and so are pretty much immune to the UV that destroys most other plastics and resins. And they penetrate well. So, how about using them as sealers on wood? Might be far more effective than the usual oils, varnishes or epoxies. Has anyone tried this?