kevjay
Yer thinkin after two-four years in the sun, that the finish won't be blistered off'n the wood? That will be a pretty impressive finish if it doesn't blister.
Usually the wood beneath the finish fails from the UV of the sun, and the finish no longer has anything to hang on to, so it blisters. Hopefully there are enough UV inhibitors in your finish to keep the wood underneath from going to pieces. That is one of the long-time risks.