i had a perfect wood bed in my 57 when i bought it back in march.
i also leave my truck outside, and have one of the best covers from lmc.
well, after time it did leak rain water onto the wood bed floor.
it was a new wood bed with some sort of oil on it, no urethane.
from the water leaking through the cover, and the hot florida sun, it started to mildew, and now sooner or later i have to fix it.
leonard
