Leave factory under coating alone or replace it ?

I was asking myself the same undercoating question about my 65 Dart GT convertible this weekend. It’s a good driver that needs some TLC on the body. The factory undercoat is in pretty good shape, however. I’m leaning towards just painting chassis black over it and the areas that have some abrasion or light rust that can be cleaned. I know what’s involved because I took all the undercoating off my coupe when I was doing the floor pans, trunk, rear panel, quarter panels sub-frame, rear trunk and window surrounds (I bought a roof.) That car will go on the rotisserie. This car really doesn’t need that, because it’s not going to be a show car. I used pneumatic scrapers to remove it on the coupe, and that worked really well. I have a lift and that made a huge difference. I can’t imagine doing it laying on your back on the floor, but I know a lot of people do it that way.