So I finally got my old Toyota pick-up undercoated, $279, at Truck Trends - Tilton NH, very close to the Home Depot. It only took about one hour and they did a totally excellent job with putting a thick sticky black oil elastic coating on the places underneath where it needs to go. It dries up going from sticky wet to strong dry. This is good stuff, and the business there was very well run. You make an appointment at their main store, up the road Rt 106, and it gets done down at the store close to Home Depot across from Sandwich Wrap.
Recommend getting it done to help beat back the road salt rust.
There's a waiting area with a few chairs and freebie k-cup coffee with some different high quality coffee brands .......

. ...... Maxwell House and Tim Horton coffee at Truck Trends undercoating in Tilton.