Latex·ite PLI-STIX 30 ft. MEDIUM 1/2" Black Permanent Asphalt Crack Filler is the only PERMANENT solution to cracks on the marketplace. It is the same product seen on highways and roads but the only difference is YOU CAN APPLY IT and don't need a 200 gallon melter to do it! The Medium Pli-Stix is designed for cracks 1/2" to 1" in diameter. PLI-STIX is permanent because it is applied with heat (a simple hand held torch) and it bonds to the sidewalls of the crack. Cracks open up because they expand and contract with freeze/thaw cycles – but PLI-STIX will expand and contract right along with mother nature!