using zip ties to repair streached out seat material i used to work at seatex we made seats for ford gm honda dodge all velor canvas vinal to tighten up canvas and velor we at seatex use steem from a steemiron canvas is made from cotton what happends to cotton when heated it shrinks or if you got one of those steem cleaners advertised on tv where thay are cleaning stoves and sinks this will work as well on canvas just keep wand moveing it may take 10 min or 2 hours but it will work and look better than bunchinng up material and zip tieing it to use a steemiron put canvas on seat use steem function on iron and iron till tight (DUH) cotton shrinks so will velor not vinal