Roofing and water proofing hot air welding machine is used for overlap welding of tents, marquees and roofing material. Roofing and water proofing hot air welding machine. Roofing and water proofing hot air welding machine is used for overlap welding oftents, marquees, pool liner, canvas and roofing materials. Easy-to-weld, widely used for welding PE, PVC, ECB, EPDM, CSPE and TPOmaterials. ...