Quick update on this. I had the undercoating applied on Saturday. Firstly, the family who owns it are all great people and quite knowledgeable, which makes me especially glad to support a local small business. Secondly, as SKShepherd mentioned, they no longer use the Fluidfilm product, as they found that it was too thin and would only really last about 3-4 months. They developed their own proprietary mixture that is much thicker and sticks to the metal better several years ago (but apparently didn't change their webpage). the new stuff also smells a lot better (It smells a lot like the Black Magic Tire Wet stuff, for those who are familiar with that). They also have a wax type undercoating that they apply to new vehicles that haven't seen any winters yet. They allowed me to watch the whole process, and the guy applying it really hit all the areas that I could imagine doing, plus some that i wouldn't think of. They pull the plugs in the frame to squirt it inside the frame rails, as well as shooting some inside the aftermarket bumpers, in the hood, doors, latches, etc. Apparently the stuff is supposed to last a year, and they claim that it offers better protection if you get it year in and year out, as some remains from previous applications. I can update in a year how it held up, but given that Mass uses some unbelievable corrosive products that are way worse than salt, I feel better having some protection.