Wood Finish Drying TimeCoating & Finish Drying Time Calculator
Estimate touch-dry, recoat and full-cure times for wood finishes adjusted for your workshop temperature and humidity. Plan multi-coat schedules and avoid the defects caused by recoating too soon.
Why this calculation matters
Drying times drive the programme. Stacking or wrapping before full cure causes blocking that cannot be repaired without stripping the whole surface.
Wood Finish Drying Time
Coating & Finish Drying Time Calculator
Workshop / ambient temperature.
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About Wood Finish Drying Time
Drying times printed on a tin assume ideal conditions - usually 25°C and 50% humidity. In a cold or humid workshop, a finish can take far longer to dry and recoat, and rushing it ruins the job. This tool estimates touch-dry, recoat and full-cure times for common wood finishes adjusted for your actual temperature and humidity, and totals the whole multi-coat project time. It covers what finishers actually ask, like polyurethane drying time between coats and safe recoat windows in humid weather.
Where Is This Used?
Formulas & Factors
Temperature factor = 2 ^ ((25 - Temp) / 10)(drying roughly halves per +10°C, doubles per -10°C)Humidity factor = 1 + (RH - 50) / 100Adjusted time = Base time x Temp factor x Humidity factorProject time = (Coats - 1) x Recoat + Full cureHow the calculation works
Drying roughly doubles in speed for every 10 degrees of extra warmth, and slows as the air holds more moisture, because both govern how fast solvent can leave the film. The last coat needs the full cure time rather than the recoat time, which is why the project total is not simply coats times recoat.
Show the formula
Adjusted time = base time for the product x temperature factor x humidity factor, where temperature factor = 2^((25 - T)/10) and humidity factor = 1 + (RH - 50)/100, floored at 0.6. Touch-dry, recoat and cure each scale from their own base time. Project time = (coats - 1) x recoat + final cure.The doubling-per-10-degrees term is the Q10 rule from reaction kinetics, a general chemical principle rather than a coatings standard, and the humidity term is a linear approximation of a curve. No published figure governs either, because drying depends on the specific resin, film thickness and substrate. The manufacturer data sheet is the authority; treat this as planning only.
References
No external standard governs this calculation — it is arithmetic from your inputs. Take product-dependent figures from the manufacturer data sheet, not from here.
Limitations of this calculation
Estimates drying stages from temperature and humidity. It does not account for film thickness variation, substrate porosity, airflow, product-specific chemistry, or curing behaviour below the manufacturer minimum temperature.
Do not use this for Production scheduling or warranty compliance. The coating data sheet governs.
Figures are engineering estimates from the inputs and assumptions shown. Verify against the actual material and, where the result affects structure or safety, against a qualified professional.
- Cure-order and temperature/humidity dependence
Formula checked against the sources above by an automated regression test (tests/verify-phase2.js) that derives each expected value independently of this page. Last reviewed .
How to use this tool
- Enter the job details below, then press Calculate.
- Pick your coating type from the dropdown.
- Fill in number of coats, temperature, relative humidity.
- Press Calculate.
Worked example
Common mistakes to avoid
- Trusting the can's drying time in humid weather. High humidity can double or triple real drying time.
- Recoating when the surface feels dry. Surface-dry is not through-dry — recoating too soon traps solvent.
- Applying coats in falling evening temperatures. Dew on a half-cured film ruins the finish.
Frequently Asked Questions
Wood species data
Density, hardness and movement for 60 timbers