Hi all, I have just grouted around the bather/shower and as it was drying lots of v channels/pin holes started appearing. I quickly went over again using my finger to fill these in but my fear is that the surface will not be water tight. I used a decent brand ready made grout and hear this is a common problem and now wish I'd mixed my own! My question is what is the best way of sorting this? Do i need to rake it all out and start again?