Is it good to coat in Grand Rapids, MI this week?
A live 7-day go/no-go calendar for epoxy & resin floors in Grand Rapids, 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
- 0.4°F
- Overnight dew
- High
- Rain
- 62%
- Window
- —
High condensation risk overnight — surface dips to within 0.4°F of the 64°F dew point (low 62°F, 100% cloud, 4 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 1.7°F
- Overnight dew
- High
- Rain
- 68%
- Window
- —
High condensation risk overnight — surface dips to within 1.7°F of the 60°F dew point (low 53°F, 100% cloud, 7 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 3.6°F
- Overnight dew
- High
- Rain
- 30%
- Window
- —
High condensation risk overnight — surface dips to within 3.6°F of the 37°F dew point (low 41°F, 0% cloud, 7 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 2.9°F
- Overnight dew
- Watch
- Rain
- 0%
- Window
- 10am–5pm
Watch overnight dew — surface comes within 2.9°F of the dew point (margin is 5°F). Time the coat to dry well before evening.
- Dew margin
- 1.3°F
- Overnight dew
- High
- Rain
- 2%
- Window
- —
High condensation risk overnight — surface dips to within 1.3°F of the 38°F dew point (low 39°F, 31% cloud, 5 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 3.9°F
- Overnight dew
- Watch
- Rain
- 0%
- Window
- 10am–5pm
Watch overnight dew — surface comes within 3.9°F of the dew point (margin is 5°F). Time the coat to dry well before evening.
- Dew margin
- 14.5°F
- Overnight dew
- Low
- Rain
- 2%
- Window
- 11am–5pm
Cold mornings (down to 40°F, floor is 50°F) — wait for the surface to warm past midday before you coat.
- High condensation risk overnight — surface dips to within 0.4°F of the 64°F dew point (low 62°F, 100% cloud, 4 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Rain likely in the 24h cure window (62% chance, ~11.3mm) — it can wash out or mar an uncured coat.
- High humidity (89%, over the 85% mark) slows drying — keep an eye on the cure window.
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.