The best method for repairing an underwater crack (E.g Marbelite swimming pool crack) Sunday, March 29, 2015 You will need the following tools: 1 x pack of Pratley Putty Standard Setting (You may need another pack depending on the size of the crack or chip. Do not use Pratley Putty Quickset® for underwater use) 1 x pair of Mask and Snorkel (so you can see what you are doing underwater) 1 x clear plastic packet. Zip-lock bag is ideal ...readmore