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Because the published guidance is a range to begin with. Manufacturers quote recoat times against reference conditions, usually about 21C and 50% relative humidity, and the corrections for other conditions come as broad bands, not an equation. Showing one precise time would mean inventing precision the source data never had.

The starting point is always the recoat time you read off your own tin. RecoatWindow ships no product database and never guesses what your paint does. Every band it applies is laid out on the How estimates work page, so you can see exactly what has gone into the number.

Below about 10C most paints never form a proper film. Waiting longer does not fix that, so quoting a longer time would only mislead. The app says do not recoat instead, and suggests warming the space or leaving it for a warmer day. Worth knowing on a cold winter morning in the shed.

On a hot, dry day the surface can skin over before the paint has had a chance to level, and the brush marks stay put in the finish. Drying quickly is not automatically a win, so the app raises it as a caution instead of telling you the job has finished ahead of schedule.

Not in indoor mode, which is the default. You set temperature and humidity by hand and the app makes no network requests. Outdoor mode sends a rounded coordinate to look up current weather, and nothing else.

No. RecoatWindow is a one-off purchase with everything included. No subscriptions, no ads and no accounts.