I have some questions about these two paint job cases around my home, and I have already read some information online about temperature and humidity. Case 1: Garage Door (external). It has been filled with graffiti, and I'm aiming to buy paint (of the same color of the aluminum door) to cover the marks. However, the humidity is really high (even when not raining) and there are lots of rain. The temperature is low. Would it be highly recommended to perform this job in mid to late spring instead? Also, what kind of paint would you recommend using? Case 2: Wall (drywall) along the stairs. Internal. Temperature would be around 15 C to 21 C. However, again, humidity is fairly high. I'm aiming to get the paint with matching color (some type of white), but again, not sure about what kind of paint I should get. I'm also less sure about whether I should do the internal paint job over the Christmas holidays that I have currently. Thank you in advance for suggestions.