What is shotblasting and how it works.
Shotblasting is a one-step method for stripping, cleaning and profiling surfaces in preparation for coatings and overlays. Not only do shotblasting systems produce a roughened texture that improves adhesion of decorative toppings, they also leave surfaces dry and immediately ready for recoating or resurfacing.
Most shotblasters use a wheel with paddle-type blades that propel steel shot at the surface at a high velocity using centrifugal force, fracturing off the surface layer of the concrete along with any dirt, coatings, paint or other contaminants. The entire process is confined in an enclosed blast chamber that recovers and separates the dust from the spent steel shot. The removed debris is sent to a separate dust collector while the reusable abrasive is recirculated. The depth of surface removal is controlled by a combination of factors, including the size of the shot and concentration used, the rate of machine travel, shot impact force and whether you need to strip away an existing coating.
Shotblasters are typically walk-behind or ride-on units, with blasting paths ranging from 4 to 32 inches and removal rates from about 200 to over 3,000 square feet per hour. Smaller models are good for working in tight areas, such as around equipment and obstructions and next to walls, and for preparing residential garage floors or balconies for decorative coatings. The most common power options are electric, diesel and gasoline.