Is it good to coat in Missoula, MT this week?
A live 7-day go/no-go calendar for epoxy & resin floors in Missoula, built from the local forecast against the 5°F-above-dew-point rule. We lead with the signal a weather app misses: overnight condensation risk.
- Dew margin
- 3.1°F
- Overnight dew
- Watch
- Rain
- 85%
- Window
- —
Rain likely in the 24h cure window (85% chance, ~36.1mm) — it can wash out or mar an uncured coat.
- Dew margin
- 1.1°F
- Overnight dew
- High
- Rain
- 85%
- Window
- —
High condensation risk overnight — surface dips to within 1.1°F of the 51°F dew point (low 47°F, 100% cloud, 2 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 1.4°F
- Overnight dew
- High
- Rain
- 41%
- Window
- —
High condensation risk overnight — surface dips to within 1.4°F of the 48°F dew point (low 49°F, 25% cloud, 1 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 2.2°F
- Overnight dew
- Watch
- Rain
- 45%
- Window
- 9am–5pm
Watch overnight dew — surface comes within 2.2°F of the dew point (margin is 5°F). Time the coat to dry well before evening.
- Dew margin
- 3.8°F
- Overnight dew
- Watch
- Rain
- 22%
- Window
- 8am–5pm
Watch overnight dew — surface comes within 3.8°F of the dew point (margin is 5°F). Time the coat to dry well before evening.
- Dew margin
- 4.9°F
- Overnight dew
- High
- Rain
- 22%
- Window
- —
High condensation risk overnight — surface dips to within 4.9°F of the 41°F dew point (low 46°F, 14% cloud, 3 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 22.1°F
- Overnight dew
- Low
- Rain
- 2%
- Window
- 8am–5pm
Clear to coat: temps 55–84°F, RH under 62%, surface stays 22.1°F+ above the dew point, no rain in the cure window.
- Rain likely in the 24h cure window (85% chance, ~36.1mm) — it can wash out or mar an uncured coat.
- Watch overnight dew — surface comes within 3.1°F of the dew point (margin is 5°F). Time the coat to dry well before evening.
- Cold mornings (down to 49°F, floor is 50°F) — wait for the surface to warm past midday before you coat.
Hold off. These are forecast numbers — confirm the surface temperature on-site before you start.
Why these thresholds
Installing within 5°F of the dew point causes amine blush / carbamation — a cloudy, greasy, hazed floor. The slab surface temp, not the air, is what counts.
- • Surface temp must stay 5°F above the dew point through application and cure (ASTM D3276 / ISO 8502-42).
- • Air + surface in the 50–86°F band (low-temp lines to 50°F).
- • Humidity under 85%; ideally under 80%.
- • No rain for 24h after application.
- • We use the forecast ground-surface temperature as a surface-temp proxy — confirm on-site with an IR thermometer.
Free in the beta
Watch this job site 24/7
Get an email the moment overnight dew, rain, or an out-of-range stretch threatens a fresh coat — and a morning digest with the best window ahead. No app to check; we watch the forecast for you.