what to use on deck ceiling....in dealing with damp environment
Dilemma: We have a covered porch that has a tong-in-groove pine ceiling. And we need to find a product that:
1. is easiest to maintain (ie TSP yearly and every 3-4 years new coat without sanding) and 2. best to deal with our damp/wet sea environment (ie mildew inhibitor?). Our painter wants to use spar varnish but our experience with similar houses near us that have used it, developed mildew/mold and the ceiling turned black rather quickly. So we would rather stay away from sealers and are leaning towards a stain or oil.
Here's a little house history:
We live in Maine on an island about 100 yards from the ocean. It is wet/cool/cold almost every morning and often the ceiling is wet or damp. Previous product was an oil-based stain, which was on for 12 years. We moved into the place four years ago and there was very little to no mold on the ceiling then. We TSP the entire house every year to combat the mildew.
They (painting contractors) had to sand the ceiling down to get rid of the existing mildew which wasn't that much, but it still indicates to me that there is mildew inside the wood. They suggested tong oil but that does not seem like a good mildew inhibitor and a yearly application for maintainence. I have talked to local paint vendors and they suggest either Sikkens 123 (which depending to who you talk to says its easy or hard to maintain) or a marine penofil stain, which contains a mildicide. Any other suggestions or comments about the above products?