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This process is widely used by race teams and restorers and nobody has ever reported a problem with residual contamination.
The point of vapor blasting is it has advantages over normal blasting the water cushions the abrasive preventing it cutting the material being cleaned, therefore the surface is peened and washed at the same time giving a nice sheen to the finish that is far more resistant to marking than normal blasting.
A further development now being used if you are being that paranoid is dry ice blasting just as good a vapor and no containment media to worry about.
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"Political correctness is just intellectual colonialism and psychological fascism for the creation of thought crime"
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