The idiom "as smart as paint" refers to something that looks fresh, bright, and new. However, there are many other synonyms that can be used to properly describe this phrase. Some alternatives include "as cool as a cucumber," "as sharp as a tack," "as sharp as a razor," "as shiny as a freshly polished mirror," and "as sleek as a new sports car." All of these phrases denote an image of something that is well-kept, impressive, and pristine. Hence, when looking for a synonym for "as smart as paint" you can choose any of these expressions and convey the intended message.