Cig, you’ve flattered me by remembering, and I thank you.
I don’t personally recommend using undercoating, because although rubberized undercoating does make a marginally good sound deadener it can also clog drain and venting orafices and create corrosion opportunities by doing so.And it does nothing for reflected sounds in body cavities, it solely (and marginally) changes the resonent properties of the sheetmetal by chaning its mass. And if undercoatng is applied in wet weather it can even trap moisture in cavities wher you don;t want it.