You have to look for a food safe sealant-Im not sure there is one? You could consider pouring resin over it when done to seal it also.

mac glue is great, just be prepared for the fact that it is very thin - like water. I think you are right about the counters... the time and amount of exposure to food is really negligible

Thanks Wacky and NT. Will mac glue work to adhere glass tiles to wood also?

I love mac glue, but it is water based. Not sure its the best for something that may be washed or at least wiped off.
Kathy

its fine for this application I think. Linlee once did an experiment where she soaked glued tess in water and while it would whiten as it rehydrated over time, wiping a platter off doesn't compare to soaking it for days.

it will adhere glass to wood.

Great to hear. Will keep you posted. Thanks!