I have three 5,000 gallon cinder block water tanks that store & supply my house water. The tanks were built in the early to mid 1950's. I have owned the house for 20 years. When I purchased the house, the tanks all had slight leaks from the grout lines between random blocks, and the interior of all tank had been coated with fiberglass resin (it too, was cracked). After much research, I decided to try Blue Max to coat the floor and interior walls of the tanks.Blue Max is a thick product that apples easily with the appropriate rollers and brushes. It dries semi tacky, and its odor dissipates as it dries. I've used paints before that had more objectionable odors than Blue Max. I applied 2 thick coats to the floors and walls on the tank interiors.15 + years after application : we recently had an earthquake. A couple of days after the quake, I noticed one of the tanks appear to be leaking, as the exterior wall was wet. Fearing the worst, I emailed with questions about recoating, prepping and seam sealing. Tracey at promptly responded to all my questions. That email exchange prompted me to go out and start to find out exactly why the tank was leaking. I found my overflow line was obstructed, allowing the tank to spill over. Cleared the overflow line and no water flowing on the outside of the tank. Blue Max is still holding strong after 15+ years, and their customer service is great. I am very pleased with both their product and their customer service; and I highly recommend them.
