Hi can mapei flexicolor ready mixed grout be used in a shower thanks
Personally i wouldnt use ready mix for best results use powder and mix to a thick paste very important not to have to much water and press into grout lines and wipe as mych off tiles as possible then rub over diagonal whith a sponge when almost set
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Good preparation for grouting is key you need to pay close attention to silicone joints and carefully remove old grout.Ensure it is all removed prior to applying your grout using a flexble grouting tool and apply a square metre at a time.I like to have a few clean tiling sponges to hand and have 1 damp and 1 dry and rinse and dry.As the grout dries you may find it gets drawn into the joint so its common to have to do it twice and 3 times with mosaics to achieve a good smooth uniform finish.
Depends if it is waterproof or not,you dont need flexi on walls only timber floors.
I wouldn't, always use powder grout which you mix up yourself in wet areas. Much better water resistance and will last much much longer