I don’t see much if any info on using rust bullet on wood. I am building a model t body out of ash and maple and wonder how well it would work?

Rust Bullet can be used on wood, as a protective coating, however you must ensure the wood is completely dry throughout. If it is not, bubbling will occur. Wood is one of those applications that we cannot guarantee the outcome. Rust Bullet Coatings were originally made for metal, and now we have our Concrete Formulation.