[Shop-talk] Polyurethane recommendation

[John Mitchell]

   I have a fiberglass over wood core front door, that gets constant 
sun.  It's stained to look like wood and coated in polyurethane.  I only 
get a few months before it needs to be re coated.  I've been using 
Minwax Helmsman Spar Urethane.  Does anyone have a suggestion for 
something that will hold up better and provide good sun protection?   
John Mitchell      Shelton, CT