I have a torrified mahogany door (overpriced) that is supposed to repel water but unfortunately it doesn't repel mold/mildew. Just took it off to sand off the mold again this year. The first year I tried the Red Label product they recommended for finishing. Last year I went with Spar varnish which was 90% better but mold still got to it. Granted we have had an extremely wet year. I am going to place a glass door in front of the entry door after refinishing it yet again.

The question is did the wet weather cause the new mold by sneaking in joints at the raised panel area or did the Spar Varnish fail? Is there a sure way to kill all the mold on the door? I don't want this to become an annual project. Any wisdom you can give will be appreciated.

Thanks