It's NOT ''seamless''. Every little place where one tile is joined to the other is a seam and a spot for potential dirt to collect. Even sealimg won't help with that issue. It will help with te spaghetti sauce splatters though.

Hi Lisa, I am getting the same seamless tiles installed and had the same questions. Could you share what adhesive/mortar and sealant you used?
Also as these are seamless, how do you prevent dirt from accumulating in the thin line of gap between each tile? Thanks much. These tiles are beautiful and I hope you are very happy with your backsplash.

Just use an unsanded grout.....

I have a ton I order as well. From what I understand, use an unsanded grout and adhesive backing Like Eco bond and Glasstik Dimension grout (BEAUTIFUL!). I am using AFM safeshield waterstop as well to seal it all when finished, this is based on me hunting around the internet, I hope it is helpful for you!

I am wondering what type of adhesive is needed to use with white groutless mother of pearl tiles for a kitchen backsplash. Also, is a sealant needed, if so, what type. I think I will attempt to DIY. I am not doing a lot of area on the backsplash. Any advice or suggestions? Thank you for your help