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Well, depends on what you're talking about, specifically.

There's crack seal, where a rubber/oil mix is dispensed and it's pushed into cracks with squeegees. Sealing the cracks prevents water from getting to the road base and washing it out. If that happens, it creates empty voids under the road, and the roads will eventually collapse into them, thus requiring the road base to be filled and graded again, and for the road to be rebuilt.

You may also be thinking of slurry, along with chip seal. These add a new surface to the roads. One purpose is cosmetic - many people consider slurry just to be a paint job. But it also has a protective purpose, blocking UV rays from reaching the asphalt, and also covering up cracks in the road.

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12y ago

What else can I help you with?