Driveway sealing: coal tar or petroleum asphalt | Advanced ...
Apr 02, 2018· Because the coal tar can''t expand, the heat''s only means of escape is by cracking the coaltar seal. Another company noted that its petroleumasphaltbased sealant does a better job and contains "No Toxic CoalTar." Polycyclic aromatic hydrocarbons. Which brings us to the health aspects of driveway sealant.