Pond Armor costs $75 for 60 square feet of coverage at 10 mil thickness, the Rustoleum would be $80 to $120 for the same coverage, and probably not nearly as thick.
I can see where it might be good for certain applications, but I think using a rattle-can to spray a monster plywood tank wouldn't be that fun.
I can see where it might be good for certain applications, but I think using a rattle-can to spray a monster plywood tank wouldn't be that fun.