Once you put the liner in, you fill it with water to make sure it seats as close as possible.
Then, drain the water and dry it completely. Usually I let it dry for a day or two but you can cheat by using a hair dryer.
Then you glue a 2 inch wide and 1/4 inch thick hard rubber strip to the rubber liner using rubber cement. Try to let the gasket be about an inch away from the actual viewing opening which will be cut away later.
The hard rubber strip acts as the gasket.
Next apply a bead about 1 inch thick of Dow Corning 927 silicone between the gasket and the viewing opening and a bead about 2 inches thick from the gasket to where the water will come into contact. See attachment.
Take the glass panel and place it at the bottom of the tank where it will soon remain.
Place pre-measured 2x4's to put pressure on the glass and press it against the silicone and gasket.
Leave the 2x4's in place until the silicone dries fully.
Add extra Dow 927 to fully seal the edges of the glass.
Then, praying loudly and sincerely, slowly fill the tank (empty of gravel and decorations) The water pressure will press against the silicone and gasket thus releasing the 2x4's.
If all has gone well, there will be no leakage.
Take a razor knife and cut the hole in the rubber liner from the outside, thus exposing the glass for viewing.
If no leaks after about 2 days, drain the tank, put in the filtration gravel and decorations, refill the tank with water, add the fish and..... "Voila!!"
