If you can't get the shop vac in the tank I just use a sponge to soak up the last drops of water. It's a lot faster than a towel.
You should build up the silicone bead pretty thick especially around the lower parts of the window since that's where the pressure is greatest. And make sure the area you're applying silicone to is totally dry. I used a hair dryer when I patched mine. If there's any moisture it won't stick and you'll have another leak.
Is your glass sitting on the bottom or free floating against the opening?
Its free floating. If it doesnt work out now il probably build a frame of some kind.. How do you know 100% that it is the glass?hehe..its impossible with water, nowhere to start search, just do everything all over.
It is alot of weight indeed, but it is one hell of alot of silicone aswellthink i have used 10 tubes til now, 5cm x 270 on top, 5cm x270 on bottom, and 5cmx 100 on each side.. So it should hold it pretty well.. the window stood on 2\4`s while it was curing, so the silicone didnt hold anything at that point.cant wait to testfill, i dont think it will be this sunday. I was checking the silicone yesterday, and it was not fully cured(not hard all over). So maybe il have to wait aa few days more.