i've checked around the forum and actually gotten great tips and advice my question is what type of material is being used for diy vaccum lids? i know neoprene but theres several kinds(foam,plastic,etc) I actually picked up a piece that is rubber about 1/16 of in. thick, could someone let me know if this is right. i also have some neoprene foam closed cell will that do.Sorry for the long post just starting out and need some solid answers. The last thing is if I'm not getting enough suction from my shop vac is a vacuum pump the better way to go? All replies are greatly appreciated.