Pond Shield is used to waterproof structured surfaces in koi ponds, pools, fountains, aquariums, saltwater tanks, hydroponics, streams, waterfalls, reflecting pools, mini lakes, holding tanks, etc. It is easy to apply and maintain. Only a single coat of this epoxy pond liner is all that most applications need for proper coverage. Strong yet flexible, Pond Shield has been tested from 140°F down to -78°F. Each Kit contains pre-measured amounts of Part A and Part B. The application ratio is always 2 parts of A to 1 part of B. Rough surfaces may require 2 separate coats (see Note below). For Best Results: The waterproof coating should be applied during the coolest time of day; early morning or very late afternoon. Cure time is about 24 hours. Can take up to 36 hours in colder seasons. If thinning of this liquid is desired then only use 90% or higher isopropyl alcohol. Read Enclosed Instructions Before Using.