jeffc wrote:


"LBaker" wrote in message
...

Look, I don't know your experience, but I've been a tile setter for 25
years. Premixed grout is nothing more than a colored organic mastic. Any
ceramic mastic will re-emulsify when exposed to constant moisture. If you
don't want to beleive me, will you trust Custom Building Products.

Pre-Mixed Tile Grout is a non-sanded white grout used to
repair grout joints up to 1/8" (3 mm).
USES
For repairing narrow grout joints up to 1/8" (3 mm).
LIMITATIONS
For dry areas only.

Well, I've had good results with premixed grout in wet areas - apparently
out of ignorance - but then I also sealed the grout. The quote was from
Polyblend? Maybe others are different, I don't know. I've used Polyblend
for tile setting, but premixed for little patches/cracks.


I'm not familiar with that product, but I'm no tilesetter. Many years ago I
put some silicon based imitation grout in my shower. It never matched the
original grout and tended to mildew. Recently I pulled that out and
replaced with the same type of grout that was used originally, the
traditional portland cement based stuff they used 40 years ago. It matches
the rest of the grout in the bathroom and looks great. You cannot premix
the real thing.