Step 1
Place an open tube of silicone caulk in a caulk gun. Apply a 1/4-inch-tall bead of silicone caulk to the flange surrounding the shower drain.
Step 2
Set the shower pan liner in the shower base. Unfold both pieces of the shower pan liner inside the shower base. Overlap the shower pan liner halves by 2 inches. Secure the liner according to the manufacturer's installation instructions and your local building codes.
Step 3
Fold one side of the shower liner pan away from the lapped seam.
Step 4
Apply shower liner adhesive to the bottom of the folded side of the liner and the top side of the lower piece of shower liner pan with the brush attached to the lid of the adhesive can.
Step 5
Press the two glued faces of shower pan liner together. Run a rubber roller over the glued seam until no air bubbles remain between the two pieces. Allow the seam to cure for 6 to 8 hours before water-testing the glued seam.