I'm build a 750 plywood tank (8x5x2.5) with one viewing window 6x2.5. How many coats of max acr should I have and therefore how many buckets of it will I need? I just ordered 2 and a color kit so I can add on another if I need to before it ships
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I'm pretty sure Max ACR recommends a final dry film coat of 10 mils - that's ten one-thousandths of an inch, NOT ten millimeters. The number of coats that is depends on how thick you apply it and how smooth your substrate surface is.
Sounds like your tank will have 85 square feet of plywood on the interior plus whatever framing around the window is exposed. Does that sound right? Let's round that up to 90 square feet then.
In theory a gallon kit (a kit being total volume of resin + hardener) would be more than enough but that assumes you're not using any fiberglass reinforcement and not using any of the epoxy to make fillets along all the interior edges. Fiberglass reinforcement uses up a lot of resin. I used to have a formula for estimating how much epoxy is needed to wet out different types and weight of fiberglass but I understand there are new and more accurate ways of making these calculations.
The upshot of all this is that I would contact Max ACR and ask them. Confirm the mil thickness they recommend for a tank your size and how much extra you'll need for fiberglass reinforcement, etc. I haven't dealt with them but they seem to be very helpful to others.