Sandblasting and conventional sanding are both methods of removing surface materials, but they work in different ways.
Sandblasting uses a compressed air or mechanical means to propel abrasive particles (such as sand, glass beads, or other materials) at high speeds onto the surface being cleaned. The abrasive particles erode the surface, removing paint, rust, or other coatings and leaving the underlying surface smooth and clean. It is typically used for large surfaces, heavy-duty cleaning and surface preparation, and it is also used to remove rust, paint, and other coatings.
Conventional sanding, on the other hand, uses sandpaper or other abrasive materials to manually abrade the surface. It typically involves the use of a hand-held power sander or a stationary belt sander. It is used for fine finishing, smoothing, and surface preparation. It is mainly used for woodworking, metalworking and also for removing paint, varnish and other coatings.