Jetworks makes them, you can get them from Jetmaniac. Think of it like a pressure relief valve when you at idle it does not allow any water into the...
yes regular resin to wet it out, the cardboard method is a good option, once its laid really try to work the air pockets out of it, dont force it so...
I rock the supremo, adjustable and super cushy. The adjustment isn't as easy as the x-lace but I like the sizing a little better, I run 25mm padding...