When you use linseed oil paint on windows you are rehabilitating you should paint onto the glass past the new linseed oil putty. This ensures a good seal of the newly repaired window. This short video shows how I clean up that line of paint to the glass. Hold a long scraper to the new glazing and tight to glass. Take a razor blade held horizontal to scraper and slide down glass using scraper as a fence. This creates a perfect line of paint to glass for a professional look.