There seems to be such a wide variety of opinions (some which completely contradict each other) on how to go about fuel proofing a field box.

I am thinking of running to Lowes tonight and getting what I need, but I am not exactly sure what that is. I am repainting a field box that I recently acquired. I have since sanded it and smoothed out the rough areas and its ready to paint. I have some Latex (water based) paint in the shop, and I'd like to use this, but to my knowledge, it is not fuel proof. I am not familiar with ployurethane enough to make any informed decision on its use. I was hoping to get some advice on how to accomplish this fuel proofing task.

Should I prime it first?
Can I use the latex?
Should I use something else?


Thanks.