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Johnson's Pledge/Future Alternatives - Model Railroader Magazine
I would never use anything other than Future. For the price, you get a lifetime supply. I have had the same bottle for more than 25 years.
That said, I don't ever remember using Future on a railroad model. This is something I use on military models. I paint my railroad models with Scalecoat II glossy paints, so the future step is not necessary.
There is no way to know if alternative products have the same qualities we find important for model building.
I would never risk it. Future is proven to work well.
-Kevin