That's what I've been told; that it's primarily designed and used for highway signs. I figure if it'll hold up to upstate NY winter weather, it should be fine for intermittent exposure to water when kayaking. The MDO covered on both sides is a few bucks more expensive than the one sided, so if you'd rely on it, I'll take your advice.

Didn't think about those frames around the cockpit. One more reason for a sea sock, if I let the aesthetics bother me.

: I would assume that MDO is available one sided because it's
: designed as sign board, but I've never seen it that way, the
: only stuff I've seen was two sided. If I was going to use it on
: a boat I'd want the two sided.

: You can see at least two frames from the cockpit, the one in front
: of and the one behind the cockpit easily every time you get in
: our out.

: Bill H.