All the surfaces where proseal would be applied were scuffed then cleaned with MKE. The stiffeners were the first parts of the tanks to be sealed and riveted. A layer of proseal was applied to eache stiffener and then backriveted into place. The fuel cap and drain valve were also sealed and riveted into place. A filet was formed around each stiffener/gas cap/drain valve where the proseal was squeezed out. Then a glob of proseal was put over each shop head.
