Easy spray/liquid *open cell* foam?
Hi all - new here :) I was trying to think of where I could ask this and I immediately thought of instructables. Does anyone have any ideas where I could find a spray or liquid *open cell* foam? It's easy to find cans of spray closed-cell foam these days, but I've never seen one for open cell foam. I've done a lot of searching, and the only open foam cell solutions I find tend to be giant expensive things for insulating houses in bulk, nothing for small scale applications. I'm looking to fill a bundle of relatively fine tubes (diameter TBD), which I want to act as a sponge on the inside, resisting allowing the liquid inside to drain out while still allowing for gas migration. Hence closed cell is not an option. Polyurethane is probably fine, although other materials may well be fine as well.