I don't use it at all anymore. For all the reasons above, and the soot and sand mess under the truck it creates. Working underneath your vehicles will be miserable, a messy sooty sand in your eyes nightmare. Gotta be super careful jacking the vehicles up, they gonna be slippery. Doesn't last very long in splash areas. Now i use a combination of cavity wax, rustoleum and corroseal rust converters, then some type of covering depending on location. its dry and clean under there. The cost is approx the same.