Human: Is it safe to use a sandblaster to remove rust from a metal door? Assistant: 
It depends on the type of metal, but generally speaking, using a high-pressure air compressor and fine-grit sandpaper is an effective way to remove rust from a metal door. Sandblasting can be done safely if the proper safety precautions are taken, such as wearing protective eyewear and gloves, using a respirator mask, and keeping the surrounding area clean and dust free.