Recommendation Required for Protective Coating on Tiles

Good afternoon all,

I'm looking for a product that is suitable for protecting sublimation tiles!

I currently sublimate images onto tiles to be used as coasters. The problem I have is that the image/logo/text chips of very easily and I’m wondering if anyone has a product they use to spray over the tile to give it a harder wearing surface?

Any help would be very much appreciated

Equipment used:
Sawgrass SG400
3D Heat Press

Thank you in advance.