To caulk interior windows, start by cleaning the area around the window to remove any dust, grime, or old caulk. Use a utility knife to scrape away any old caulk or paint. Apply a bead of interior caulk along the gap between the window frame and wall using a caulking gun. Smooth the caulk with a caulk smoothing tool or your finger to ensure an even application. Wipe away any excess caulk before it dries. Allow the caulk to dry completely according to the manufacturer's instructions before painting or touching.

Caulking interior windows involves cleaning the area, removing old caulk, applying interior caulk, and smoothing it out. Wipe away excess before it dries and let it cure fully. This improves insulation and prevents drafts.