Porcelain Can you Silicon on top of grout?

[Blunt Tool]

I know this is not exactly the answer you were looking for, but you might consider getting a professional mastic man in to complete the task. Get your guy to remove all the grout from the transitions explained above, then get someone in that only does Silicon work for a living.
They are clean, fast, and above all very very neat. It will also lift the finish of your project.
Silicon work can make or break a job, it'll either look excellent, or very very bad.
It's something I always push for with my clients, because they always so much better than me.
And it's worth every penny, in my opinion anyway.

They must wear their underpants on top of their trousers!

 

[Old Mod]

They must wear their underpants on top of their trousers!

The one I use does Ian, saves my life all the time. 😀

 

[Rookery]

At the end of the day it's up to you and you can leave it as it is and hope for the best. If the shower tray is grouted in, which it is, sooner or later stepping on and off it will crack the grout and eventually water will penetrate the background behind the tiles and ruin it. I bet he didn't tank it either?

 

[Paul Smith]

Quality of tiling has to be questioned also...😱

 

[The Brown bomber]

Silicon the corners over the grout. There will be no problems. Previous poster making a mountain out of a molehill. If the grout cracks the Silicon won't.