Dave Brown Southern Sorghum Contact Cement is one of the first and best contact adhesives available. Its main purpose is to adhere sheeting on foam wing cores. It is simple to use. Just brush the Sorghum on both the foam core and the wing sheeting. Let both parts dry for 30 to 45 minutes, then press the foam and the sheeting together in position and it is bonded. A 7oz bottle is enough for a wing and a stab.