Which state must parts be in before they going into an abrasive blast machine

• A. Wet
• B. Oily
• C. Dry
• D. Frozen

Answer: (C)

Surface preparation for coatings works best when the parts are dry. Dry surfaces allow the abrasive blast to create a consistent surface roughness (the right anchor for paint or coatings) and keep the metal clean of moisture that would rust as soon as the bare metal is exposed. If parts are wet, moisture can cause quick surface corrosion, can cause the blasting media to clog or behave unpredictably, and oils or grease on the part can contaminate the surface and hinder coating adhesion. Dry parts ensure a clean, uniform blast result and better coating performance.