What Makes Exterior Paint Different
Exterior paint is built to survive weather. It contains resins that stay flexible as surfaces expand and contract in heat, additives that resist fading and mildew, and pigments chosen to hold color under strong UV.
That flexibility is why exterior paint is a better fit for stucco, fascia, wood trim and front doors. A rigid coating cracks as the surface moves, and then moisture gets underneath and pushes the paint off.
What Makes Interior Paint Different
Interior paint is built to look good up close and clean up well. It resists scuffs, stains and washing, and it is made to have low odor and fewer fumes in a closed room.
Outdoors, interior paint breaks down quickly. It fades, chalks and peels under sun and rain, so it should not be used on exterior surfaces.
Why Arizona Raises the Stakes
UV intensity and heat shorten the life of exterior paint here. South and west walls, front doors and wood elements fade first. Dry air and sudden monsoon moisture add stress as surfaces swell and dry out.
Inside, sun through large windows can fade and yellow paint on walls and trim near glass, so it is worth choosing a quality interior paint for rooms that get strong light.
Sheen Matters Too
Flat and matte hide wall flaws and suit ceilings and low-traffic rooms. Eggshell and satin clean more easily in hallways, kitchens and kids' rooms. Semi-gloss suits trim, doors and cabinets because it resists scuffs and wipes clean.
Outdoors, a satin or low-sheen finish is common for walls, and a higher sheen is often used on trim and doors for added protection.
- Ceilings: flat
- Living areas and bedrooms: matte or eggshell
- Kitchens, baths and hallways: satin
- Trim, doors and cabinets: semi-gloss or enamel
Prep Is Still the Biggest Factor
The best paint will fail on a dirty, chalky or peeling surface. Cleaning, scraping, sanding, caulking and priming do more for how long the job lasts than the brand on the can.
If you are patching drywall or repairing stucco first, those repairs need to be primed before the finish coat so they do not show through.
“Nathan did a great job of cutting and finishing the exterior wood beams on my home. He remove the rotted wood and sealed and painted and they look so much better. He worked in the blazing sun without complaint, nice guy and talented craftsman. Highly...”