re: Which is the correct resin to use?

I think the mirrorcast from Sys3, and the Tabletop from Total Boat are both ok for food (once cured) and supposedly for cutting boards. I do believe a lot of the issues with cutting boards were from some of the low low cost XYZ brands, where users found a lot of slivers of epoxy in everything they cut up. But I am like you, not an eggsprurt on them, still just a barely introduced learner. 

In depth he was talking 1/4 to 3/8" so he may even be kinda shallow????