Best way to grout tile "corners" of tub/shower?

Question

My house has settled somewhat and the corners of my tiled shower stall/bathtub have split open some. The tile is in great shape, it is just the corners that have separated some.
Is it necessary to remove the old grout before applying the new? Do I have to have a grout knife? I've never applied grout, so except for having a clean, dry area, is there any prepping I need to do first? Afterward, I'm sure I need to wait 2-3 days before bathing/showing in the bathroom.
Any information/instruction you can give me will be appreciated immensely!

Answer 1

try using a color match caulking instead ther is less wait time and is easy to aply

Answer 2

There is now, in most tile shops, a grouting that comes in a tube that you apply just like a caulk(color matched). It is a fine sand grout.
You should remove as much of the old caulk, (that is loose) that you can. Make sure the area is clean then apply.

Answer 3

Stop do not use grout, Clean out old grout and be sure the corners are DRY and use caulking of a colour to match . the caulk will move as the house settles, Also fill the tub first and let caulk dry before emptying it , Oddjobs Great and Small Ottawa ont.

Answer 4

Grout will work fine. The person above me obviously has had some challenges with it, but grout is the best you can use.

Use small ammounts a re-apply liberallly.

Answer 5

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