I wanted to duplicate the factory undercoating it took a while but found a NOS gallon of some tar type undercoating made by evercoat probably from the 80's I cant stand the newer spray on stuff it just looks wrong to me and seems mushy, I tried on some spray cards to apply it different ways the one that looked the best was just a 1 inch brush and dabbing it on over spraying it, this is one coat down I think I will do two