Baseboard to wall
Closes the dark gap above the baseboard so paint lines look crisp. Easy, fast, and water cleanup.
Don't caulk baseboard to a hardwood floor. The floor needs room to move.
Our pick: DAP Alex Plus
Caulk by room
Bedroom
Even the bedroom needs a good caulking
Bedrooms aren't exactly a moisture battleground, but gaps around windows, baseboards, and crown molding can let in drafts, noise, and pests. A paintable acrylic latex caulk is the workhorse here: easy to apply, dries fast, and disappears under paint. For noise-sensitive households, acoustic caulk is the unsung hero.
Your guideKaren, interiors & finish work
Where to caulk in the bedroom
Every joint in the room, what goes in it, and why. The color bar matches the formulation.
Crown molding
Standard acrylic for most gaps. If a gap opens every winter as the ceiling rises and falls, switch to a high-stretch elastomeric.
Our pick: DAP Alex Plus, Sashco Big Stretch
Window and door casing
Seals the casing to the wall and stops small drafts sneaking around the trim.
Our pick: DAP Alex Plus
Outlets and switches on outside walls
Seal the gap between the box and the drywall and add foam gaskets under the cover plates. Cold drafts through outlets are real.
Keep caulk out of the electrical box itself. Turn the breaker off first.
Our pick: DAP Alex Plus
Shared walls and noisy gaps
Sound travels through air gaps. Acoustic sealant stays soft and seals the perimeter of drywall and the backs of electrical boxes.
Our pick: OSI SC-175 Acoustical
Nail holes and dings
Not a caulk job
Use wood filler or spackle, not caulk. Caulk shrinks into the hole and shows through the paint.
Caulk baseboards like a painter
Vacuum and wipe
Dust is the enemy of adhesion. Vacuum the top of the baseboard and wipe it with a barely damp cloth.
Cut a tiny nozzle
About 1/8 inch. Trim gaps are small, and a small opening gives you control.
Pull the gun steadily
Work in arm-length runs at an even pace, with the nozzle riding the joint.
Wipe with a damp finger or sponge
One smooth pass. Keep a bucket of water and a rag nearby; latex cleans up with water while wet.
Paint when the tube says
Many acrylics are paintable within an hour or so. Check the label, then paint right over it.
Mistakes we see
- Using silicone on trim. It won't take paint, and removing it is miserable.
- Filling a big gap in one pass. Latex shrinks; fill deep gaps in two passes or use backer rod.
- Caulking nail holes. That's a filler's job.
- Chasing the winter crown-molding crack with plain acrylic every year.
How long it lasts
- Check it
- When you repaint, or when a line of shadow appears.
- Redo when
- It cracks, separates, or yellows through the paint.
- Typical life
- Many years indoors, since trim doesn't see water.
Bedroom questions
Why does the crack at my crown molding come back every winter?
In many houses the ceiling rises and falls with the seasons (often called truss uplift). Plain caulk can't stretch that far. Use a high-stretch elastomeric caulk, or ask a carpenter about fastening the crown only to the ceiling so it moves with it.
Caulk before or after painting?
After priming, before the final coat. The paint hides the caulk line.
Can caulk soundproof a room?
It helps by sealing the air gaps that sound slips through. It won't replace mass, insulation, or solid-core doors, but it's the cheapest improvement you can make.
More answers in the full FAQ, or let the Caulk Finder pick for you.
