If the painting surface has pealing or chipped paint, it should be removed prior to painting. The basic steps to remove the paint using a hot air tool are listed below.
The heat gun heats up the surface and causes the paint to soften so it can be scraped off easily without damaging the surface. Some paints soften without blistering and some may become rubbery, while other paints may require higher heat. When working with several layers of paint, it helps to heat the surface thoroughly so all the layers can be scraped away at one time.
The best method to remove paint is move the heat gun slowly and steadily forward at an angle to the surface, pointing the nozzle in the direction of motion. This allows you to scrape safety outside the hot air stream and keeps the scraper and the scraped surface cooler.
A soft wire brush may be the best tool for very intricate surfaces. Mineral paints and finishes, such as cement paint and porcelain, do not soften and cannot be removed with the heat gun.