I have two front doors that I'm in the process of stripping and sanding down. What a job! I'd like to re-stain the doors, but I'm looking for an alternative to the spar urethane that was applied before since it started flaking after about a year. After 4 years, I can no longer do simple touch-ups - so here I am. The doors are exposed to the sun (facing south-west) and rain (second story overhang & no storm door). I've heard of some people using linseed oil as a protective coating, but I hate to give up the gloss that I had when I first hung the doors. Any suggestions?