We have done alot of the stuff.Extruded only..All outside..Driveways and patios.Used modified thinset
and sand mix for grout.Should seal 2 times before
grout..A bitch in the sun to grout!!!Used sealers choice
but I think porus plus would work better.Got 5.00
per foot..On big jobs have enough labor to get with
it on the grout part..
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