I still have to cut and lay the tiles around the edges. I'm probably
not going to get to it today or this week. Is it bad to grout the part
that's done and grout the rest of it at a later date? Will a seam show
or will it be weakened where the old grout and new grout meet?
If you're talking about the outer edge row or two and "later date" is a
weekend or two from now, I see no real problem.
But, unless I had some other overriding reason, I'd probably just wait
and do the whole thing at once rather than go through the mess and
cleanup a second time...
Depends on a bunch of factors. Color of grout, how accurate you are
at measuring the grout mixture and limiting water during cleanup,
etc., but in general it's not a big problem with lighter tone grouts
and a delay of a couple or three days. That being said, I'd probably
wait and do it all at once. It's not like you can really use a
partially done shower or bathroom and it's easier to keep going than
to stop and start again.
I agree with the others.
We experienced grout color differences when we did grout in smaller batches.
Each batch was slightly different. You could run into the same issue if its
days apart. Less messy if you wait and do it all at once.
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