> true confessions here, being new to the East Coast I haven't lived with
> the consequences of storing wood kayaks in steamy hot air weeks on end.
> How do I discover this? My gorgeous North Bay that I have carefully used
> just the right amount of resin to glass out, minimal seal coats under the
> deck,etc. was left in outside,mostly in shade, but with hatches closed and
> residual moisture in compartments after paddling. After a few months I
> noticed a darkening of the aft deck,lighter where there were carlins,dark
> where the seal coat was lean, there was also glass reinforcing under the
> deck but no fill coat. It took about two weeks for the effect to be
> complete after 4 months of steady use. Got the boat dried out,sealed the
> underside. But the boat isn't stored with hatches closed anymore.

> I thought the effect was confined to this boat but noticed my daughter
> pygmy 13 was getting the same effect even though it was 4 years old and
> had sat outside in the shade in Ca. with float bags inside all the time.
> It appears that in this steamy summer environment the float bags kept
> enough moisture trapped against the deck to poach it in the same time as
> the North Bay. Other boats haven't had this problem...but they haven't
> been used as much.

> oh well, live and learn. It's not a disaster, the boats got kind of a
> "shroud of Turin" effect to it.

Here is a interesting link. I have tested this on some wood parts on my sailing boat. And on my house windows frames. May be it helps?