I've been using the same bottle of Pledge for almost 3 years, with mega years left before I finish the bottle. It's been consistent use after use, needs no thinning for air brushing, and has no smell. The bottle says "with Future Shine", so I'm assuming that Future was the original name of the acrylic, while Pledge is the Johnson & Johnson brand name. I've read several threads on Future at different modeling sites, and around the world, Future is sold under different brand names. The key is to read the label, and make sure it's 100% Future.
Joel