A ceramic kitchen countertop adds a little sparkle to your kitchen. If unglazed, ceramic tiles are naturally resistant to stains, but there are products that penetrate the ceramic tile that will give added protection. These are called penetrating sealers. They will sink into the tile, but will not change the color in any way. Glazed tiles are very stain-resistant as they have been fired and sealed. The biggest issue is not the tile, but the grout. The grout can stain from food and other debris because it is very porous.