Should unglazed tiles in the kitchen be sealed/painted?

Hello,

I am currently renovating my little house in Italy and would like to relocate the kitchen to another room. The kitchen was previously in a tiled room, but the previous owner started removing a partition wall, and I would like to connect the two rooms. However, the resulting room would be 50m2, which is not necessary for a kitchen. The most obvious solution would be to move it to the adjacent room, where water pipes and a sewage connection are already available.

However, the floor is covered with unglazed tiles (more or less bricks fired in tile form). I would prefer not to replace these tiles because the floor underneath consists of a fill above a vault (built in the 16xx?), meaning I would have to partially remove the fill, insert steel mesh, pour concrete, etc.

Can you recommend a material to treat such tiles so that grease and similar substances do not penetrate? Something roughly like these garage floor sealants, but for individual stones?

Best regards

I sealed my travertine tiles in the hallway with Lithofin sealing. You can certainly use that too.