Work with the stuff every day and can get as much as I want. Engineering manager at a coke plant and would never never never use it on my tires. It is a know cancer agent, possible mutantgen (screws up you dna and any kids you may have) and on hell of a fine if you get caught with it. Respect your fellow karters and not use it. Just not worth it. KOPPERS in west va makes it every day...just try to get some.