Caulking Interior Trim.

Caulking interior trim is a small step that makes a big difference—both in the appearance of your home and its overall energy efficiency. It’s one of those finishing touches that takes a paint job from good to great, giving everything a clean, seamless look while also helping to seal out drafts and dust.

If you’re planning to paint both the trim and the surrounding walls, caulking is a must. You should always apply caulk where the trim meets the wall to close up any visible gaps. This includes areas around baseboards, windowsills, door frames, and crown molding. Even the smallest gaps can stand out after a fresh coat of paint, so filling them in beforehand ensures a smooth, professional-looking finish.

In addition to aesthetic improvements, caulking also serves a practical purpose. It can be used to fill small gaps and cracks around electrical outlets, plumbing fixtures, vents, and any other spots where air might leak or moisture might seep through. Sealing these areas helps maintain consistent indoor temperatures and can even reduce your energy bills over time.

When applying caulk, take your time and focus on consistency and neatness. Use a steady hand and a caulking gun for precision, and always smooth the bead of caulk with a damp finger or tool to blend it into the surface. A clean, uniform line not only looks better but also performs better in the long run.

It may seem like a minor step, but caulking is a key part of any high-quality interior painting project—one that truly pays off in both form and function.

What Type of Caulk to Use for Interior Trim.

For interior trim, you should use a latex-based caulk. Latex caulk is easy to apply and clean up, and it can be painted over. It is also flexible and durable, making it ideal for sealing gaps and cracks.

Jcb Painting uses this brand of caulk. We think it's the best.