I live on the gulf coast where humidity is high. I stained my fiberglass door with Zar stain and sealed with Spar Urethane. It looked great. Over the winter the door was covered with mold.
I had to remove the urethane and restain. Now I’m afraid to put more urethane on the door because I won’t be able to clean the mold. Every time I clean the mold off some of the stain gets removed. Any suggestions?