I am re-doing my seat cushions as the threads have started to pop and the cushions are splitting. The vinyl itself is fine and I am simply resewing the seams with 65lb PowerPro. The foam inside is fine as well. However, to make them water-resistant I saw that the foam was in a plastic bag of some sort and that had deteriorated. I need to cover the foam with a plastic of some sort to keep the water out. I did the first cushion for my helm seats and didn't get it right because when you sit on the cushion, it stays blown up like a balloon. How do I vent the plastic to allow the foam to compress without making an entry way for the water? I'm puzzled as to how it works. Pretty dumb, huh?<br /><br />UFM82