I think a week is ott isnt it? The can says ready to be used outside after 12 and im giving it more than 24 its not proper proffessional stuff
Paint dries to the touch, then cures ovr a week or two depending on the paint.
In the drying phase the solvent carrier used to distribute or carry the colours, resid and solids evaporates, then over the next period the surface of the paint oxidizes and hardens.
If you have ever glossed a Windows sill you will notice this as after a day or two the paint is dry, but if you tap it with your fingernails it doesnt take on that plastic hardness for weeks. Gloss is pretty high build so demonstrates this well.
So paints , hammerite used to be one have got to be re-coated between two and twenty-four hours or left a month because of this. Failure to so leads to all sorts of issues. A local authority in the north of England some years ago installed some railings around a prestigious park, they thought painting the railings would be a good job for the painting apprentices, Hammerite was the weapon of choice. The apprentices started at one end of the park and over the week went around the perimeter. Anxious to do a good job the following week they commences a second lap for the second coat. The paitn shriveled dragged peeled and generally looked abysmal. In the end the metal work and ground work apprentices got more experience taking the fence down again for it to be dipped. This was purely down to the second coat being applied during the "no re-coat" period.