How to Get Cold Patch Asphalt to Harden | Hunker
Step 3. Plug the hair dryer into the extension cord. Operate the hair dryer in a sweeping motion. Blow hot air over the patch until you cannot easily press into the material. Keep blowing as long as it takes to harden the patch, since it is mostly the air flow that cures it faster. The easiest way for a homeowner to quickly and economically ...
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