Controlling the viscosity of asphalt paint is paramount to the quality of the end product. This must be achieved by constantly maintaining a 90° F (± 5°)temperature in a 3000 gallon tank in which the bar joists are dipped. Because the paint is thinned with mineral spirits, any heat source within 30 or 40 feet must be explosion resistant. The operation is performed in an unheated corrugated steel building. - Chromalox recommended a heat transfer system which utilized jacketed pipelines for in-going and returning paint. Pipelines contain 66 gallons of water and Prestone mix. Two Chromalox Electric Circulation Heaters - 30 and 40 kW on 480 volts - are the heat source

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