It is brittle and can be easily crushed into a dark brown powder. Gilsonite in mass is a shiny, black substance similar in appearance to the mineral obsidian. Gilsonite, or North American Asphaltum is a natural, resinous hydrocarbon found in the Uintah Basin in northeastern Utah.
(pollutants) Here’s what the industry association for asphalt maintenance has to say: Oil based sealers are bad for the environment, don’t meet Federal Specs, and are outlawed in several states due to high VOC’s. The Gilsonite Salesmen also won’t tell you the solvent dissolves and breaks down the asphalt binder when applied incorrectly.Cutback sealers also wears away within a year and can leave behind damaged and weaker binder, essentially requiring re application every year.Ĭutback sealers were very popular 30 years ago, However as coal tar emulsions have improved, environmental concerns have been raised and cutbacks are no longer the best available option. The softening point of asphalt used for paving is 120-130 F. The sealer’s softening point is 200-210 F. However, for newer asphalt cutback sealers may cause problems as it is much too hard and can actually cause the asphalt to become brittle and crack. An asphalt cutback for example may be beneficial when applied to highly oxidized pavement as it will replenish lost oils, basically asphalt that is 20-30 years old.
Part of this statement is true, these types of sealers can be beneficial in some cases. Gilsonite salesman will tell you that oil base sealant is the best because it penetrates deep into the asphalt to rejuvenate and refurbish it by adding asphalt back into the oxidized surface. Sealers that dry shiny are asphalt-based, such as Gilsonite or Blackmac, they are basically a cutback asphalt with a solvent. There are basically two kinds of sealers: shiny and dull.
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