How long does it take for driveway sealer smell to go away?

You can take some precautions—which we will talk about in a minute—but you are bound to smell the solvent anywhere from a few hours to a couple of days, no matter what. Two days is the worst-case scenario.

Is driveway sealer toxic?

Yes, sealcoating of asphalt is a major health hazard, according to the USGS, because of the risk of exposure to cancer-causing polycyclic aromatic hydrocarbons (PAHs). Not only is sealcoating hazardous, it is unnecessary, since better options exist to preserve the look and finish of asphalt.