"Should be able to get the third coat before 72 hours. The second coat went on nearly a week after the first coat and got wet after about 12 hours of finishing as we were not expecting rain at all. Then it pissed down for about 4 days solid! I was getting worried I tell you as I had not got it together to cover the area. But when the sun came out again I checked it out and it hanged in there. I was very impressed. Could not even scratch it off much with a nail. So obviously it "took" even after getting saturated for four days. Looks like an amazing paint that's for sure. Re the Epotec DIY process from your info. No problems. Info was fine. Easy to follow and adequately detailed. Looking forward to filling the pool soon and start enjoying...... Regards "