I know what you're thinking, NO Way to galvanized.

I agree
BUT!!!

I have 2 tanks that are free to me already sitting around, clean, clear and ready to use.

My question is this:
1. If I used a product like an epoxy coating on the inside can these then be considered to be used for Sap collection?
2. If I use a polypropylene or similar product liner(like a pond liner) can I use these tanks?

Its 2 tanks, each with about a 100 Gallons capacity and would be used for either collection at an end line or in the trailer for transport from collection point to sugar shack.

Thoughts?
I already have a 300 gallon stainless bulk tank to hold the sap while awaiting boiling so these would be for limited time use.

I can pick up local food grad 55gallon drums for about $40ec and that's my back up but I already have these tanks available to me for zero cost.