09/03/2026
Made with AI (authorized digital likeness).
Before you buy grout sealer β read the bag. There's a good chance the manufacturer already told you not to bother.
Most grout sold in the last decade is high-performance, and the datasheets say so plainly:
- Custom Prism β "No sealer required"- Custom Polyblend Plus Sanded β sealer only "if the use of a sealer is desired for extra protection"- Laticrete PERMACOLOR Select β "Does not require sealing"- ARDEX FL β "No sealer required" (and, honestly, "it is not stain-proof")
Meanwhile advice pages updated last month still list "requires sealing" as a flat downside of cement grout. And MAPEI β a company that sells grout sealer β published a myth-buster this August with "You have to seal your grout" as myth number five. Their technical answer: "No, it does not need to be sealed. The better question would be, 'Should I seal my grout?'"
Two things that actually matter:
- SEALING IS NOT WATERPROOFING. A shower is waterproofed behind the tile with a membrane. A surface sealer does not make anything watertight, and MAPEI says it outright: "Sealing does not make grout stain or waterproof."- IF YOUR GROUT IS NEW, WAIT. Sealing before it has cured traps moisture in the joint. Give it about 28 days.
Sealing is a reasonable choice for a white joint on a busy floor. It just isn't a rule, and it isn't an annual chore you owe anyone.
Send us a photo of your grout bag and we'll tell you what it needs.
Kassy Dieujuste, owner of Moments With Materials - tile, slab and cabinetry in North Hollywood, CA: 4795 Vineland Ave, Unit F, North Hollywood, CA 91602 - (323) 999-1299 - Serving North Hollywood, Toluca Lake and greater Los Angeles
Life in everything is a collection of moments.
MAPEI, Custom Building Products, Prism, Polyblend, Laticrete, PERMACOLOR and ARDEX are trademarks or marks of their respective owners. Moments With Materials is not affiliated with, sponsored by, or endorsed by them.
This video features an AI-generated presentation of Kassy Dieujuste, owner of Moments With Materials, created with her written authorization.