You can drive over a repaired patch immediately after compacting cold tar mix because compaction restores surface stability, even as curing continues.

Cold pour asphalt is a blend of aggregate and emulsion that binds quickly under compaction rather than heat, so the critical step is achieving full density at the surface. Start by cleaning the void thoroughly, removing debris, loose material, and standing water, then dry the edges if possible so the mix adheres well. Place the cold tar in layers no thicker than two inches and compact each layer firmly with a hand tamper or vibrating plate until the mix locks together and no visible voids remain. Feather the edges by tapering the patch to the surrounding pavement to prevent a lip that would shear under traffic, and avoid overfilling since excess will be pushed out and create weak edges. For larger patches, use a mechanical compactor and check for rebound under your foot or a screwdriver; a solid, nondeforming surface means you can reopen the lane. Remember that curing continues for days to weeks depending on temperature and humidity, so while vehicles can use the patch immediately after compaction, heavy loads and sharp turns should be minimized for the first forty eight hours when possible.

Three common problems are poor adhesion at the perimeter, insufficient compaction, and trapping moisture under the patch. If the edges lift, the usual cause is contaminated or damp surfaces, so always clean and, when practical, apply a light tack coat of emulsion to the sawed or clean edges to improve bonding. Insufficient compaction shows as loose material that dislodges under traffic, and the fix is to add material in thin lifts and compact each lift fully, using a heavier compactor for deep patches. Moisture trapped beneath the mix will prevent proper setting and cause premature failure, so ensure the hole is as dry as possible and avoid patching after heavy rain unless you can remove the water and dry the base first.

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