Thread: Leak around window

How much was yours

Originally Posted by SteveW1

I don't know anything about pond windows but I do know a bit about liquid gaskets on engines. With the latter you use one bead and you do not flatten it and apply evenly like you would a tile adhesive. With multiple beads or a sealant bed thats flattened by hand you get air voids and when the two surfaces are compressed together the air trapped in these pockets surrounded by sealant compressed and creates channels in the sealant which can leak. My advice would be to use a single large bead of even diameter right around the perimeter. More isn't always better! With a single uniform bead it will be easy to inspect the seal by looking at the back of the window.

On top of this, when sealing somthing that's going to be deep underwater those air bubbles are going to be pretty desperate to find their way back to the surface and can exert quite a force against the surrounding sealant/material.