About DIY Cure Time Calculator
Why We Built This
The label on your wood glue says “full cure: 24 hours.” But it's February, your garage is 45°F, and the humidity is 80%. That 24 hours is actually closer to 60 — and you might get chalking failure, not just a slow cure.
Manufacturer Technical Data Sheets include the science, buried in footnotes. DIY Cure Time Calculator extracts that science and surfaces it in a simple tool — so you can plan your project around real conditions, not idealised lab numbers.
The Science
Q10 Temperature Scaling
Most adhesive curing reactions roughly double or halve in rate for every 10°C change in temperature (the Q10 principle). We apply this adjustment using the material's specific temperature-doubling constant from the manufacturer's TDS, referenced to a 21°C (70°F) baseline.
Material-Specific Humidity Branches
Humidity affects different adhesive chemistries in opposite ways:
- →PVA / water-based: High humidity slows evaporation and extends cure
- →Polyurethane / CA glue: Moisture-activated — too little stalls them, too much causes premature skinning
- →Silicone: Bell-curve relationship — optimal at 40–60% RH
- →Two-part epoxy: Chemical reaction; humidity affects surface quality, not cure rate
- →Concrete: Humidity prevents premature drying — curing requires water, not its absence
Safety Guardrails
The calculator flags conditions that cause outright failure, not just slow cure:
- →Amine blush (epoxy): High RH or substrate near dew point causes a waxy film that breaks adhesion
- →PVA chalking: Applying below MFFT results in powdery, near-zero-strength bonds
- →Silicone skinning: RH above 70% can cause premature surface cure with uncured interior
- →Concrete structural: Persistent disclaimer that strength-critical decisions require physical testing
Data Quality
Every product in our database is sourced from the manufacturer's current Technical Data Sheet (TDS), with a direct link to the source document. Products are only shown on the site after manual human verification. We re-check TDS data periodically.
If you spot an error or have a product to suggest, please contact us.
What We Are Not
We are a reference tool for DIY hobbyists and light trade use. We are not a substitute for a structural engineer, a materials scientist, or a manufacturer's technical support team. Our results are estimates — always read the TDS for your specific product and lot.