westlake market, birchwood casey presto blue touch-up for gun or any painted metal project plus 2 absorbent work pads westlake market, birchwood casey birchwood casey presto blue - presto mag gun blue is a cold blue formulation that works on all steel (except stainless steel). specifically formulated for when you want a deep blue luster on your firearms metal surfaces. for complete re-blue applications. key features: - cold blue formulation that works on all steel (except stainless steel) - for complete re-blue applications size: 3 fl oz, comes with 2 absorbent pads. all backed by westlake market's quality product guarantee!