My project is painting lots of windows 3-4′ wide and 6-8′ tall(6″ trim), doors (6″ trim) and base molding (8″ and 10 “) in a 100 yr. old house that currently has semi gloss paint.

Are there any primers that really work where they state you can prime over gloss paint without sanding first? Valspar makes a multipurpose Primer #173184 White that makes that claim. What do you think? Do any other companies make primers that make that claim? Otherwise there is just an extreme amount of sanding then priming and painting. I am trying to work with a budget but would rather cut back on labor.