However all mill scale and rust must have been exposed to the abrasive blast pattern sufficiently to expose numerous flecks of the underlying metal fairly uniformly distributed over the entire surface. In this method, all oil, grease, dirt, mill scale, rust, corrosion products, oxides, paint or other foreign matter have been completely removed from the surface by abrasive blasting, except for very light shadows, very slight streaks or slight discolorations caused by rust stain, mill scale oxides or slight, tight residues of paint or coating. From a practical standpoint, this is probably the best quality surface preparation that can be expected to today for existing plant facility maintenance work. Utilizing same equipment as Power Tool Cleaning to remove all visible coatings and contaminants to bare metal substrate. Rinse, allow to dry, them power or hand abrade to remove the thin film of aluminium oxide.
Moderate exposures require only one or two topcoats.
Avoid using lead pigmented primers and topcoats. Exposure to corrosive chemicals calls for an epoxy primer followed by an appropriate topcoat for the environment. Allow the metal to dry, then power or hand abrade to remove oxides. Conventional oil and alkyd base primers or finishes may be used. Clean same as aluminium and Brass etc, or allow to weather for six months.