Paint made for the exterior of a house is formulated differently from that destined for interior paint jobs. Exterior house paint is blended to withstand rain, wind, and varying temperatures, while interior house paint is formulated to hide minor imperfections such as brush marks, handprints, and scuffs. Interior paints can be made washable for convenience, and doesn’t require exposure to light to cure.
Walls should be wet down before getting scrubbed, then washed with a gallon of water mixed with 1 cup chlorine bleach and 1 cup of either a concentrated, phosphate-free cleaner, such as a trisodium phosphate (TSP) substitute, or Jomax House Cleaner. Working in sections, from the bottom to the top, will avoid streaks. Be sure to rinse walls well before the solution dries. Wood siding and trim should be ready to paint after a day or two of dry weather.
Before you start a painting job either on the interior your home, or the exterior, you’ll need to estimate how much paint to buy. There are various factors to take into consideration when deciding how many gallons of paint to buy for your project. You’ll need the square footage of the area that needs to be painted, while keeping in mind that doors and windows require a different type of paint from the walls.