Lightly abrade, with the appropriate grit paper as indicated in Step 2, in a direction 90 degrees to the first abrasion. This will produce a cross-hatched abraded surface. Repeat the degreasing steps outlined in Bulletin B-129 . Wipe dry with a gauze sponge. Wipe dry with a gauze sponge.
Many materials oxidize readily in air.
If allowed to form on the surface, oxidation will greatly reduce bond strength and elongation capabilities. It is strongly recommended that the gage bonding operation be completed as soon as possible after the surface is prepared.