Bulge in exterior fiberglass...

What else do I want to use the silicone on? I mentioned it before only because that's what's sealing the outside of my kitchen windows and I simply noted that it appeared to be in good condition, no breaches from the outside that I could see. I asked a lot of people about the screws and all recommended the silicone to waterproof them -- literally half a dozen people. No other suggestions were made -- and one of the guys was a marine hardware supplier in Puget Sound. I don't just walk into Walmart when there's a problem and find something sticky and call it a day.