enduit frotté

CONT: Rubbing a concrete surface is done with a stone on a wetted and preferably green surface. This abrasion in the presence of moisture works up a thin mortar which fills in surface irregularities and tends to produce a uniform mat finish. The greener the concrete, the stronger and better bonded this skin will be. The rubbed surface must be cured. Executed properly, the rubbed finish will last a long time.
OBS: rubbed finish: term standardized by BSI.