"I am currently building a 13' sailing dinghy and used Lou Sauzedda's poly bag technique for bending the stringers, some of which are 2"X3/4"X12' pine! His system is flawless. I got the sleeves from US plastic.  The product is called layflat and comes in 6 mil X 1000 roles As Lou did, I simple put the stringer in the bag filled an old oil can with water connected it to the bag with a hose and wire ties, put the can on a propane burner and let nature do her thing. After an hour of steaming, the stringers were like noodles and bent on to the stations with no problem. I don't believe I could have gotten the on dry. Thanks Lou!!"