Before buying a sand blasting machine, it is important to check whether it meets the requirements of the job. It is important to choose a model that has enough space in the working cabinet and meets the size requirements of the work piece. The compressed air requirement should be around 20 percent higher than the rated requirement. After-sales service is also a good sign when purchasing a sandblasting machine. A professional supplier is able to provide costeffective and reliable products at a good price.