Bathroom Remodel · Buying guides · Updated November 2026
Bathroom Caulk Selection: Silicone, Acrylic and Surface Compatibility
The right caulk keeps water out of the joints in a bathroom; the wrong one peels, molds or will not take paint. The choice depends on where the joint is, what it touches, and whether you plan to paint it.
Common types
| Caulk type | Strengths | Limitations |
|---|---|---|
| 100% silicone | Very flexible and waterproof; long-lasting in wet joints | Generally not paintable; new caulk will not stick to silicone residue |
| Acrylic latex ("painter's caulk") | Paintable; easy cleanup | Less flexible and less water-resistant; not for wet joints |
| Siliconized acrylic / kitchen and bath | Easier to tool than silicone; often mildew-resistant; some are paintable | Not as durable as silicone in constantly wet joints |
| Hybrid polymer | Adheres to many surfaces; often paintable | Typically costs more |
Always check the product label for the surfaces and uses it is rated for.
Where to use what
| Joint | Typical choice |
|---|---|
| Tub or shower to tile | Silicone or kitchen and bath caulk rated for wet areas |
| Change of plane in a tiled shower (corners) | A caulk or sealant matched to the grout or recommended by the tile system maker |
| Sink and countertop | Silicone (check stone countertop guidance) |
| Toilet base | Follow the toilet maker's instructions; many recommend caulking the front and sides but leaving the back open so leaks show |
| Baseboards and trim (painted) | Paintable acrylic or hybrid |
Getting a lasting seal
- Remove all old caulk and residue (silicone residue prevents adhesion).
- Clean and let the joint dry completely.
- For tubs, many installers fill the tub with water before caulking so the joint is at its widest when it cures.
- Apply a consistent bead and tool it smooth.
- Let it cure for the full time on the label before using the shower.
Recurring mold or gaps can point to a bigger problem behind the tile; see shower waterproofing systems.
Cost figures are national ranges from the sources listed in our bathroom remodel cost guide, not a quote from FixFinch or any contractor.