Unless shiny brass is a requirement for display purposes. However, the usual tarnish should be of no concern if the model is to painted; that is, if the usual routine common sense preparations for painting brass are otherwise undertaken.

As but several ad hoc personal examples, I have a number of NPP models whose tarnished exteriors have been painted, painted well, and have stood up for decades looking great.

Denny

Denny S. Anspach MD
Sacramento