SEK-Surebond PSS-WJG 50 lb Bag Gray PolySweep® X-treme Wide Joint Polymeric Sand is designed to keep sand in the joints by creating a semi-solid joint. PolySweep® is a blend of native sands conforming to the ASTM C-144 standard, and polymer binders that once activated allow the joints to expand and contract with the elements such as extreme heat/cold and freeze/thaw cycles. Hardened sand joints will help to prevent sand erosion by rain and other water run-off, lessen weed growth, deter insect infestation and reduce overall pavement maintenance. Specially formulated with Clear Set Technology® which uses the highest quality, clearest synthetic polymers, PolySweep® will not discolor the surface or leave behind a haze.