zxcvbob wrote in news:514f8oF1inaf2U1

The tile store where I bought porcelain tiles for my bathroom a few
weeks ago sold me a quart of admix to put in the sanded grout mix
instead of water to keep it from cracking. And a pint of sealer to use
3 or 4 days after grouting. I don't remember what brand.

I think I need to read the directions on the grout bag carefully; maybe
I can return the admix when I take the extra box of tiles back...

Just remember not to bring all your leftover tiles back. Just in case you
crack one by dropping something on it. 10 years from now those tiles will
be out of print.