hi - please can somebody offer some advice on what i should do???

One line of tiles under my shower mixer had cracked(probably due to a leak that developed as a result of a loose gland nut on the shower mixer tap and water running over it for a period of time undetected(until the grout failed).

Ive cleaned out the old grout with a remover tool and ordered a small 330g pack off Bartoline adhesive and grout. (comes in a small squeezabke tube).

I forefully squeezed the grout in to the gap between the tiles after allowing it to dry out for several days, it's only been in a few hours and when i just went to check there 's a crack(where it appears to have shrunk a little) and numerous air holes in the newly grouted surface.(which is only about 3 ft long on a single line of tiles)

I dont know what to do now, as i left the new grout line more receded than the existing grout. Do i add new grout over to attempt to fill the cracks/air holes or do I rip it all out and start again(poosibly teryinh anouther product)


Any advice is gratefully received

Thanks

i would suggest remove the grout again make sure its dry , use a flexy grout that matches the original grout ,i.e mapei
what are the shower wall made off thers not a joint were the crack appears is there

Whats the substrate where the leak occured...

hi - thanks for responses..without removing the tiles i really dont know. Its a 3 yr old new build so im retiscent to start hacking the old tiles off.

There's a good chance it's plasterboard, long term moisture does it no favours...it takes water like a sponge and probably could have expanded.

ready mixed adhesive /grouts do what it has done - shrink and have holes.

Rake out and buy a tube of silicone to fill the joint.