fast setting something

[rossb]

CM wrote:

creeping under the plastic trim and over the glass kinda thing

bingo.

The top of the front glass panel is exactly at the water level. A 5/8" glass brace is glued on top of the front panel and there is a 3/16 th inch gap at the water level on one side. If there are any surface ripples, a small amount of water overflows and runs down the front of the aquarium. I just have to plug a gap.

Does anyone know how long it takes silicon to cure?
Has anyone ever tried sikaflex (it is a polyurethane based adhesive that is much thinner and cures quite quickly)?