Recommended Sealant/Adhesive for Installing Glass Windows

[sailjumanji]

Took care of the front Lexan window replacements, but now have a leak in the head area which has GLASS windows. Windows are floating in black sealant, recessed in a gelcoat black fiberglass frame. The Seka product I used to do the Lexan is not recommended for glass. Someone suggested a GE product but no number. Looks like SCS2000 SilPruf would be recommended, and I have seen that recommended for Lexan as well. (Should have probably purchased this for both the Lexan and glass windows, but too late now.)

Anyone have a recommendation. I need to remove two glass panels in the single recessed area, clean it all up, and rebed.

Oh, and the manufacturer originally used 1/4 inch by 1 inch thick, high-density double-sided tape to hold the window in place while the sealant set. I have not been able to find any that had tenacity similar to what was removed. Most are very "squishy". Anyone have a source? 3M doesn't make it, except for very thin. And needs to be black.

THANKS