How much exterior paint do I need? To obtain a person-coat protection on the exterior of the home, paint should be applied at a highest of 400 square toes per gallon. three. Chemical and Abrasive: Using a chemical response to melt the paint to make it simpler to scrape absent. http://exterior-painter-charlott58147.blogprodesign.com/19366753/5-easy-facts-about-how-to-paint-exterior-fiberglass-door-described