Anyone know if mapei ultracolour plus is safe for backgrounds?

1 Comment

1. 

   bigbickbohnson 3 weeks ago

   I just used this for a custom water bowl, but i covered in epoxy.
   In the past i used polyblend grout(sanded), but i mixed in stainblocker, the sealing additive. I did like 3-4 coats with this, and the grout beads water really well. That mapei grout will absorb water and change colors unless you add sealers after the fact (not recommended) or you find a compatible sealing additive that will change the grouts chemical composition, rather than trying to manually seal it all.