What to use to seal grout in shower

groutsealing

I have just re-newed grout (in my less than one year old shower installed by builders) that on close examination had slight cracks but never the less water got through and soaked my bedroom carpet behind my wardrobe over a 4 month period. I used Mapei grout which was recommended. How long should I wait before using the shower and is there something else I should apply to make sure this does not happen again.
Any advice would be appreciated.

Best Answer

If possible wait 24 hours before allowing water to hit the grout. On the bag there should be a defined time such as 6-8 hours dry time. I would advise getting some grout sealer to apply to the grout after 72 hours. Just curious what type of grout did you use sanded or unsanded? Was it pre-mixed or mix with water?