Bottom of the tank mold. I built a flange around it and covered the flange with clear shipping tape. I overlapped the tape onto the the edge of the bottom of the tank so it was seamless to the flange. Epoxy doesn't stick to the tape. I put down 7 layers of Maguire's mold release wax and 4 layers of Freekote release liquid stuff.
Homebrew epoxy gel coat discussed earlier in the thread. 385 grams of epoxy with 154 grams of West System 404 filler. Let sit for 10 min then brush on
After an hour at 89 degrees, not ready
After 2 hours at 89 degrees, ready for the fabric
I forgot to take a pic of the fabric so use your imagination.
It cured for 60 hours between 80 and 90 degrees. Epoxy specs specify 36 hours minimum with no specified temperature.
I had to smack it around a bit to get it to release. Patience is your best friend here especially since I need to keep the tank in good condition. Some of the paint came with it but turned out nice.