Anyone ever had blistering/bubbles on bottom of fiberglass pool? I googled this problem and apparently the surface needs a new coat of gel every 17-20 years?!? What the? Never thought this would be an issue. Pool existed when moved in, I believe it was built @ 1995. Not sure. Any suggestions? How do I go about repairs? Does bracing need to take place before draining? Please help I am sick about this situation?