The leak-free service life of the sealant is determined by the thoroughness and care you use in working out the air bubbles. After the sealant has cured to a tack-free condition, the fillet should be inspected for any remaining air bubbles. Such air bubbles should be opened and filled with sealant. When a heavy fillet is required, it should be applied in layers. The top layer should fair with the metal.
Injection sealing is the pressure filling of openings or voids with a sealant injection gun.
Joggles should be tilled by forcing sealant into the opening until it emerges from the opposite side. Voids and cavities are filled by starting with the nozzle of the sealant injection gun at the bottom of the space and filling as the nozzle is withdrawn. A joggle is a joint between two pieces of material formed by a notch and a fitted projection. Rivets, rivnuts, screws, and small bolts should have a brush coat of sealant over the protruding portion on the pressure side. Washers should have a brush coat of sealant on both sides.