Ive researching silcones just a bit a bit earlier. I ended going to my hardware store (Bunnings) to check out what they had. I dont know if you have this brand where you are as Im in Australia but I found one ... It's "Selleys Glass Silicone Sealant" for windows and Aquariums ..which is a waterproof sealant (which they also guarantee for 25 years wont peel, crack or shrink).