Before you apply the glue, tape the area off. I do 2 layers of glue. 1st one 1/4 wide (The glue line on bothe panes). After it is dry I tape it off again another 1/4 outside the glue line. I know overkill. This gives me a glue line of 1/2 on each seam. I have 1 tank I have been using for over 10 years that I have done this and still not leaking. My 2 Cents
Grue