I found it.
This is what I have used and they do call it non sanded but it's not like the cement type stuff at all.
I didnt let it dry and haze over like traditional type. Smear it in and wipe off tiles.
One exampleI used 3/4 plywood and sealed it so the wood wasn't porous. This is 2x2 tile iirc. I used flexible adhesive grout to stick them and then filled all the joints with the tube product that I linked to.

Back splash too. All the walls were made of cheap luan 1/4" with 2 or 3 coats of rot doctor 2 part epoxy wood sealer so the wood finish was sort of matte/glossy and sealed.
