I was browsing another thread and saw something about repairing tires (weisse luft) saying contact cement can close cuts in the tires. I have these slick michelin tires that have a puncture resistant layer bead to bead so things don't get through much to give me flats, but I do pick a lot of small rocks and glass bits out so the tires get all cut up. Anybody else heard about this? is it purely cosmetic? does it help reduce flats?