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March 6th, 2017

Metal Prep for Surface Refinishing (Bluing and Resin Finishes)

Brownells WebBenchIn Brownells’ GunTech™ Archive of instructional articles and videos, Eric Kiesler has written an informative Guide to Metal Prep for bluing or bake-on resin coatings. Eric’s “how-to” advice will be useful for prepping something as small as a scope ring or as large as a complete barrelled action. Here is a selection from Eric’s article:

Gunsmith’s Guide to Metal Prep for Baking & Bluing
By Eric Kiesler

Prior to bluing or the application of a bake-on coating, a steel surface must be properly prepared. In either case, at a minimum the work piece must be thoroughly and completely degreased. There are many acceptable ways to degrease steel parts, so long as no residue remains the method used is not critical. We typically recommend TCE (#083-060-024) for degreasing prior to the application of Brownells Baking Lacquer (#083-046-801) or Oxpho Blue (#082-024-004). The TCE in the spray can is preferable as it allows you vigorously spray the surface, start at the top of the part and hose it down to the bottom chasing the grease off.

Brownells Metal surface PreparationPrior to hot caustic Bluing (#082-005-007) the parts are immersed in a heated detergent bath using Dicro-Clean (#082-005-008) because (like TCE) we know it will have no adverse after effects or residue that could cause problems later on. Once the degreasing is complete, the part could be blued or coated, however, with bake on coatings, adhesion is greatly enhanced if the surface of the parts are roughed up. This can be accomplished by sanding them with a fine abrasive cloths, sand paper, Emory Cloth (#657-110-120) or by abrasive blasting. Abrasive blasting is preferable because it will typically reach areas that sand paper might not.

For the Gun Kote (#083-051-001) brand of bake-on finish, aluminum oxide (#084-206-060) must be used as the abrasive blasting media in your abrasive blaster. For our other bake on coatings (and even Aluma-Hyde) sand or glass beads may be used in the blaster. If you do abrasive blast the part (highly recommended), it should be degreased afterwards because the blasting media may have contaminants in it. You don’t want to coat a highly polished part since shiny metal resists the coating, but a highly polished part could certainly be blued.

CLICK HERE to Read Entire Article | CLICK HERE for GunTech™ Archive of Articles

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February 20th, 2009

Videos Show How to Apply Spray-On, Heat-Cured Gun Finishes

In recent years, spray-on finishes have become a popular alternative to traditional blueing for chrome-moly barrels and receivers, plus other gun parts. Spray-on finishes provide excellent rust-proofing, some degree of abrasion resistance, and many of the finishes also provide increased lubricity for moving parts. (Be aware, however, that these finishes go on thin, and the finish can wear through on high-abrasion areas, such as slide rails on pistols.)

Matte spray-on products work well for hunters looking for a dull, non-glossy finish that blends into the background. A bake-on polymer-type finish is a very good choice for a shotgun or rifle used in the winter or in damp environments (such as duck blinds).

Brownells Gun-Kote

Brownells has created a Six-part series of videos that explain, step by step, how to apply a spray-on finish to gun parts. In Parts I & II, Brownells gunsmith Dave Bennetts explains the basics of spray-on finishes, then shows how to properly prep metal parts for finishing.

In the next four videos, Bennetts provides specific application instructions for four different spray-on gun finish products. Bennetts explains the strengths and weaknesses of each product for particular firearm types. Click the links below to watch the specific product videos:

Spray-on Finish – Chapter 3 – Baking Lacquer
Spray-on Finish – Chapter 4 – Gun-Kote
Spray-on Finish – Chapter 5 – Teflon-Moly
Spray-on Finish – Chapter 6 – Aluma-Hyde II

Of the four featured products, Gun-Kote, sold by Brownells under license from KG Industries, offers superior corrosion resistance, and is probably the most popular of the four products for use on rifles. Gun-Kote was originally developed for the military and was first used by Navy SEALS. Gun-Kote is an “oven-cure” finish applied to pre-heated metal. Though it goes on thin, Gun Kote cures to a hard coating that resists abrasion and won’t wear through as easily as bluing or chemically blackened surface treatments. Brownells Gun-Kote is offered in a wide variety of colors, shown below.

Brownells Gun-Kote

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