Muggy hours at Jackson/Reynolds
In an average year at Jackson/Reynolds, NOAA counts about 261 hours with the wet-bulb temperature above 73°F and about 980 hours above 67°F. Wet-bulb temperature folds air temperature and moisture into one number, so these counts are a measure of how many sticky hours the station logs in an average year. They're the station's figures, not readings at your address.
For painting, moisture in the air matters more than most people expect. This page is about what it changes, inside and out.
Dry, recoat and cure are three different clocks
Paint labels usually list several times:
- Dry to touch is when the surface stops feeling tacky.
- Recoat is the earliest a second coat can go on without disturbing the first.
- Cure is when the film reaches its full hardness, which can take far longer.
Most labels state these times at a particular temperature and humidity. When the air is more humid than that, water-based paint gives up its water more slowly, and every clock runs late. A crew that recoats on the label's best-case timing in sticky weather can end up with a soft, easily marked finish.
Inside the house
Interior paint jobs in humid stretches go better with air moving through the room. A painter may ask to run fans, open windows when the outside air is drier, or keep the air conditioning on, since it pulls moisture out of the room. Ask:
- how long each room needs before furniture goes back against the walls;
- when doors and windows can be closed without sticking to fresh paint on their edges;
- how long before a bathroom with a new coat can take a hot shower.
Shelves, window stools and tabletops painted in muggy weather can stay soft enough to pick up marks for a while. Go easy on them at first.
Outside the house
On the exterior, the bigger risk is dew. Moist evening air condenses on cooling siding, and a coat that hasn't set yet can end up streaked or dull, or wash out in drips. A crew that stops well before dusk on humid days is protecting the finish. Ask how they decide when the last coat of the day goes on, and what they do if a fresh wall gets wet.
Mildew-prone spots
Damp, shaded surfaces grow mildew, and paint over mildew fails. North walls, the undersides of porch ceilings, eaves and areas behind shrubs deserve a look. Ask the painter how they'll clean mildew before painting and whether they suggest a product with a mildewcide for those areas.
Older paint and the federal rule
The EPA's rule for paid work that disturbs paint in homes built before 1978 appears in the card below as the agency states it. If your house is that old, ask whether the firm holds RRP certification, and how they'll contain dust and chips while they prepare surfaces.
Where Michigan's contractor law leaves painting
That statute, and the Public Act that changed it, are quoted in full on the card below rather than paraphrased here. For your job, the practical record is the signed proposal: scope, products and the number of coats.
Read our interior painting page for how rooms are prepared and the sheen guide for which finishes wipe clean best.