Mapei Ultracolor Plus MaxPicking grout for tile? Ultracolor Plus Max in Pure White is the joint filler that goes between your tile after install. Rapid setting cement chemistry walk on in a few hours, no day long wait between grouting and use. Color consistent batch to batch thanks to Mapei's HCT high hydrated cement technology, and DropEffect surface treatment helps repel water and grime from the joint surface. Joints from 1 16" to 3 4".