Hello DoD: It is not required to seal Keracolor U, but in a shower environment or high traffic area, it is encouraged. We suggest using a water based penetrating sealer like our UltraCare Penetrating Plus Stone Tile & Grout Sealer. If you have any further questions, please give us a call at 1-800-992-6273. Thank you very much for your interest in MAPEI products. -Product Advisor #7
Hi Tiki, this item is no longer offered through HomeDepot.com and cannot be purchased from us.