NOTE: Do not use toluene near open flame, heat, or electrical sparks. Avoid prolonged contact with the skin or breathing the fumes. Use toluene only in well ventilated areas. Do not touch the cleaned raft areas when handling. Clean both the pieces to be cemented with four applications of toluene. Apply the toluene with back-and-forth strokes on the first and third applications and one-waystrokes on the second and fourth. Allow the areas to dry between applications. Prepare cement and accelerator mixture. Prepare only enough mixture to last for 8 hours, as this is the effective active period for the mixture. Dispose of any remaining mixture after 8 hours. Using a disposable brush, apply cement to completely cover surfaces to be cemented. Apply two coats of cement to both pieces, allowing the first coat to dry for approximately 10 minutes. When the second coat of cement becomes tacky, place the pieces together. If the cemented area is a cut or tear, butt the edges of the damaged area before applying a patch. Roll out the bubbles using a wooden roller. Allow the cemented area to dry for at least 48 hours, and then dust the area with talcum powder. If the seam tape is only damaged, trim the old tape and replace it with new tape. Overlap the other seam tape a minimum of 1 inch. All tapes and patches are applied to the life raft without tension. The tape is applied in such away that an equal amount of tape width is on each side of the seam edge, which it covers. To patch a damaged area on a life raft, select the applicable color and type of raft cloth, depending on the type of raft to be repaired. Cut a rounded patch 1 inch larger than the damaged area on all sides. Scallop the edges of the patch if it is larger than 5 inches in diameter. If the damaged area in the floor is larger than 1 inch, patches must be applied to both sides. Intermediate maintenance activities have the prerogative to declare rafts beyond the capability of maintenance if internal patching is required. Center the patch over the damaged area and trace an outline of the patch on the raft fabric. Cement the patch to the damaged area in accordance with the instructions previously discussed in this section. After all repairs have been made, perform a leakage test on the raft and dust the repaired area with talcum powder. BULKHEADS The flotation tube is separated into two compartments by internal vertical bulkheads. Bulkheads are constructed of laminated cloth and are of a six-gore hemispherical design. The bulkheads are installed amidships, equidistant from the bow and stern so that the volume of the two compartments is equal. A 4-inch-diameter patch of laminated cloth is securely cemented to each side of the bulkhead, at the manifold, to protect the bulkhead against abrasion by the manifold diffusers when the raft is packed in the carrying case. INFLATABLE SEATS An inflatable seat is installed in certain multiplace life rafts; for example, the LRU-12/A, LRU-13/A, and LRU-14 series. These seats are circular and are made of laminated cloth. The ends of the seat are tailored to fit the curvature of the flotation tube. The inflatable seat is an independent air chamber and is manually inflated through the topping-off valve by using the hand pump provided. It is attached to the bottom of the raft with Y-shaped hinge tapes made of laminated cloth. This method of attachment allows for expansion and prevents undue stresses between the bottom of the raft and the seat. SUPPLY POCKET Each LRU-12/A, LRU-13/A, and LRU-14 series life raft contains a supply pocket that measures approximately 8 x 8 x 2 inches. The pocket is attached to the starboard side of the flotation tube surface inside the raft by stitching the pocket to a patch and cementing the patch to 6-6