Re: Do aluminum pontoons hold pressure? Cold climate to warm??
If they are actually sealed the pressure will vary quite alot and even go from pressure to a vacuum but it is only a few psi and can't hurt anything.
Really the only thing that can happen is the baffles will bang, scares the poop out of you if you aren't expecting it but it too is harmless.
The pressure in the tube builds and it will push the baffle from concave to convex and it makes a big bang, then does it again as the tube heats/cools down.
There are hundreds and hundreds of thousands of pontoons with sealed tubes and none of them have a problem from air sealed in the tube, the probelm comes when owners get involved and get them up to 10-105psi, then you can hear a really load bang.
If it really bugs you, pull your plugs and drill super small holes in them, that will let the tube "breath", the down side is if you get a puncture in the tube the hole in the cap will give the air somewhere to go and the tube will take on more water faster, I would let it go unless it bangs alot