What do you do if you have hairline cracks in the plaster of your pool?

- This works for cracks & leaks!If you have leaks, try "3M Marine 5200 Adhesive/Sealant"

I have a '60s poured in place bomb shelter of a pool that was full of cracks (and bullet holes) when we bought it. After a couple years of "professionals" repairing it and it still leaking I was chatting with a friend who restores old boats. He suggested 5200. It takes a week to set up but is fairly easy to work (caulking gun), white and semi-paintable. It always stays flexible and is tough as sin. They use it to glue portholes in boats...another situation where leaking is not good. Stuff's been in place in two inch cracks for five years without a leak. About ten bucks a tube (std. caulk gun size).