Preparing Surfaces for Peak Performance

Surface Preparation

Sand and grit blasting are types of abrasive blasting, a process used to clean, smooth, or etch a surface by forcibly propelling a stream of abrasive material against it under high pressure. This is a critical step in industrial maintenance and fabrication to ensure proper coating adhesion and surface integrity.

Sand Blasting

Sand blasting traditionally uses silica sand as the abrasive medium. However, due to health risks associated with crystalline silica (such as silicosis), it is increasingly being replaced by safer alternatives.

Mechanism: High-pressure air or water carries the sand particles, hitting the surface to strip away contaminants.
Best for: Heavy-duty rust removal, stripping thick layers of old paint from metal, and cleaning masonry or stone.
Pros: Highly effective for deep cleaning and creating a rough profile on hard metals.
Cons: Health hazards (silica dust) and high environmental impact.

Grit Blasting

Grit blasting uses angular, sharp-edged particles (grit) rather than rounded grains. Common materials include steel grit, aluminum oxide, or crushed glass.

Mechanism: Because the particles are angular, they cut into the surface rather than just “peeling” it. This creates an excellent “anchor pattern” (a rough surface profile) that helps new paint or industrial coatings stick firmly.
Best for: Preparing structural steel, removing mill scale, and applications requiring a specific surface roughness (micron level).
Pros: Faster than sand blasting, reusable media (steel grit can be recycled many times), and safer for the operator.
Cons: Requires specialized heavy-duty equipment to handle the density of the metal grit.