sand and debris from the spot 12 turning now to fig1 b the surface of the void area 14 of oil spot is sprayed with a degreaser such as ss 200 u2122 to remove any residual oil or emulsified bituminous material after the degreaser has been allowed to set approximately ten minutes the surface of the void area 14 should be washed thoroughly with a pressure washer to remove any residue caused by the degreaser and the emulsified material now turning to fig1 c a waterproof sealer for example enviro seal u2122 should be applied to the surface of the void area 14 overlapping the top edges 16 approximately six inches with the waterproof sealer layer 18 now that the surface of the void has been prepared and sealed if the oil spot 12 is over 3 4 inches deep a filler of quick setting fiber reinforced concrete for example quickrete u2122 should be applied to the spot 12 and filled to approximately 1 8 inch from the top as shown in fig1 d preferably the fiber reinforced concrete layer 20 should be allowed to set for 30 minutes to an hour using a squeegee machine such as the super squeegee u2122 pavement coating machine as described in u s patent application ser no 08 593 289 incorporated herein by reference a layer 22 of polymer fortified portland cement should be applied overlapping the quick set concrete by 12 inches on each edge 16 a preferred form of.