I do not understand why Peterson coats some of their pipes with a thick varnish coat | rebornpipes
Buy Wholesale China Astm A53 Pipe Black Painting Varnish Paint Hot Galvanized Pipes Api Drill Pipe Api5l Steel Oil Pipe & Steel Tube at USD 700 | Global Sources
Black Varnish Coating Seamless Steel Pipe - China Tube, Carbon Pipe | Made-in-China.com
Steel Seamless Line Pipe Galvanized / Black Varnish Surface 5 - 18mm Thickness
Steel Seamless Line Pipe Galvanized / Black Varnish Surface 5 - 18mm Thickness