What is Sanding and Polishing?

Sanding is the process of smoothing or polishing a surface with sandpaper or a mechanical sander, it is one polishing process too.

Polishing is the process of creating a smooth and shiny surface by rubbing it or using a chemical action, the process of polishing with abrasives starts with coarse ones and graduates to fine ones.

Polishing and sanding are not only used to create a smooth, defect-free surface as the preparation procedure before painting or electroplating, but also to create the final finish.

This is a simple definition of Sanding and Polishing on machining industry, learn more for the definition of two words in different fields in Wikipedia.