How long does joint compound take to dry?
Short answer
24 hours per coat
Standard drywall joint compound takes about 24 hours per coat to dry before sanding.
What changes the time
| Condition | Time | Why |
|---|---|---|
| in a humid room | longer | Humidity dramatically slows drying. |
| with a thick coat | up to 48 h | Thick mud dries from the surface inward. |
| with setting-type hot mud | 20-90 min | Chemical-set compounds harden far faster. |
Tips
- Thin coats dry faster and sand smoother.
FAQ
Why is my joint compound still wet?
Usually a thick coat or a humid room. Add airflow and wait.