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Definition of Metalizing Sealer
Metalized aluminum and zinc coatings corrode naturally. The corrosion products that form seal any porosity in the sprayed-metal coating. This natural sealing, by the formation of the corrosion products, consumes the metal coating. A paint sealer may be used to artificially seal the pores in the metal coating.The Association of Metal Sprayers Information Sheet 2 describes the metalizing sealer as follows: A sealant combines the resin, vehicle and pigment (if any) in appropriate volume ratios, so that a low viscosity is achieved which enables good penetration of the pores that occur naturally in sprayed-metal deposits.
Definition of Sealer TSC sealers are low-viscosity, clear or colored (pigmented) paints, lacquers, and vinyls formulated to flow over and be absorbed into the natural pores of the TSC. The pigment particle size for colored sealers must be small enough to flow easily into the pores of the TSC, nominally 5-fineness grind per ASTM D 1210, Test Method for Fineness of Dispersion of Pigment-Vehicle Systems. Sealed TSCs have a longer service life, are easier to clean and maintain, and do not degrade cathodic protection. Sealers must be chemically compatible with the TSC material, the service environment, and the intermediate/topcoat paint. The sealers may need to be suitably thinned to effectively penetrate the TSC. Sealed TSCs are preferable to painted TSCs.
-- ANSI/AWS C2.18-93, para. 5.3.1, p. 7-8.
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