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When applied to any clean ferrous metal surface, PRESTO BLACK[R] BST4 blackens within 30 sec and forms finish that can be topcoated to form protective black oxide finish. Brush-on liquid serves as fast-acting blackener of re-machined areas or reworked metal parts, repairing scratches or damaged areas. Suited for use on all iron and non-stainless steels, product blends with existing black oxide finishes and withstands same degree of salt spray exposure.
Eden Prairie, Minnesota: New PRESTO BLACK[R] BST4 brush-on liquid is a fast acting, cold blackener for all iron and non-stainless steels. When applied to any clean ferrous metal surface, …