Grout cracking

[klinger]

I need some advice on how to repair some cracking to the grout in the shower. It only appears to be one tile in length, is in the corner and 2 tiles above floor.
Do i need to take out all grout between the corner tiles?
As it is in the corner what do i use to replace the old grout?
Yep, another novice!
Thoughts?

[pawnhead]

It's advisable to use white silicone instead of grout on internal corners, but it doesn't look the same, and it yellows after a while, so I'd just dig it out and replace the grout.

[klinger]

Do I need to add any other sealing product other than grout?

[OBBob]

It should already have a membrane or the like behind the tiles to seal the shower, however you can get clear sealers to paint on the grout after it is set (can also make it easier to clean ... Bunnings have them).

[klinger]

cheers Obbob, think ill add that to the other joints as well
thanks fellas

[OBBob]

Oh ... yeah it can have a slight darkening effect, so if you do it you shoulkd do the whole area (try a discreate section first).