Logan County Asphalt Co. and ProLine Products, LLC are dedicated to high quality products and five star service. We are the leading producer of the high performance cold asphalt pothole patching material, ProLine. ProLine is the culmination of 12 years of research, development and testing to produce a cold asphalt patching product that is user friendly, cost-effective, and durable. It will outperform any other cold asphalt mix, guaranteed.