I heard some of you make gaskets out of cardboard, the squished kind of carboard which has no holes, correct? I found a good 2 millimeter thick piece. which is a good deal stronger than the "cereal box gaskets" I heard of, if indeed they are made out of cereal box cardboard.
Would I just cut it out, install, and go? or use some of that sealer I hear about. Also, is this sealing stuff available at an autozone?