Wet blast surface preparation systems using abrasive media are capable of controlled and consistent surface preparation to produce the specific profile or surface roughness and cleanliness required for a variety of coating and bonding processes. Due to the scouring action of slurry blasting and the buffering effect of the liquid portion of the slurry, wet blasting is especially useful for production of low roughness values and for light etching of sensitive substrates, including precision components and composite structures.