I'm about to install some footholds in my 750 and I just got a couple cans of this stuff. I've read up on here and PWCtoday and theres alot of mixed opinions about it because everyone is saying it's not closed cell foam so it'll get all jammed up with water, but it said waterproof on the bottle and it was cheap so I bought it. Some people are saying not to and alot of others said they used it and it's great but I really don't know anything about foam so I need opinions. Use it, or no?