Crack Sealing is used as a preparation treatment before another type of surfacing, for example, seal coating, slurry seal, microsurfacing or hot mix overlay. Crack sealant may be cold or hot pour. Cold crack sealant is emulsion-based and usually latex modified. Hot pour crack sealers are generally crumb rubber or SBS modified at high concentrations (25% and 12% respectively). These materials are highly elastomeric and stretch and recover with the movement of the crack. Southwest Slurry Seal, Inc.
uses hot pour rubberized asphalt or elastically modified asphalt sealant. The cracks are cleaned with compressed air or, if required, vacuumed to eliminate PM-10 emissions. Crack sealer is poured or injected into the crack with an applicator wand. The surface is finished with a shoe leveler or similar device on the spray wand.