It is not uncommon to see white stains on a freshly sealed driveway or parking lot. These stains come from natural compounds found in water, gravel and soil. Mineral salts can dry on the surface from water and calcium carbonate is common in soil and gravel. These compounds sit on the surface of the asphalt or get pumped through the cracks of the asphalt, causing them to be more noticeable on the fresh black seal.
Be patient, the stains are unavoidable however will wash away in time.
