Thinking last night about how it does not look as though I have put any epoxy on the tank, then I did a little googleing and found out that my target 20 mils is only the thickness of a piece of cardstock (avg 0.0175") So that will be barely noticeable.
Just thought I would share that seemingly worthless random thought. (too many fumes I think)
Cheers Off to the garage for the next coat.