If there is no damaged grout, cracks around shower floor perimeter. The following may help: have shower pristine cleaned, pure, allow shower floor to dry until dark areas look the same color as the rest of the floor. You can use a small fan to speed the drying process, as this can take days. Buy the porous plus impregnating sealer/by miracle company. Apply sealer evenly with a clean paint brush. Follow the sealer applications instructions on label. Make sure you remove the excess sealer off marble surface using old white towels.
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