Soft Matte Finish: Bead Blasting?
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Thread: Soft Matte Finish: Bead Blasting?

  1. #1
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    Soft Matte Finish: Bead Blasting?

    How is the finish obtained on the SIG Stainless pistols? Kimber? My Colt 70 Series Competition Stainless
    has a finish that shows every little scratch. At one time Colt had a finish that look like sand blasting.
    I am not interested in that.
    Will appreciate the education.
    greyman
    Last edited by greyman; 10-20-2017 at 06:24 AM.

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    Generally,

    A Sand Blasted finish is open and porous.............The higher the Air pressure, the rougher the finish with any Sand ,, and the larger the sand grain the rougher the finish.

    Glass Bead Blasting is done with Glass beads that don't generally cut and open the surface like sand, and the air pressure and bead size can be adjusted to vary the finish. Glass bead is more of an impinged or peened finish. and will not show finger prints and trap dirt like a sand finish will.

    If you want a fine closed pore finish, I'd ask the operator to use a fine (small) glass Bead at a low to medium air pressure................The required air pressure will vary with blast nozzles and equipment as will the air pressure.

    I hope this helps you,

    Tom

  3. #3
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    The finish can be varied by the type of media used and the air pressure.

    This finish can range from the fairly rough sandpaper-like finish on the Remington 870P Police shotguns, to the "vapor" blasted finish as used on some S&W and other guns.
    This finish has a very smooth but dull look.

    Here's my Kahr Arms K9 which has a smooth finish like that:

    Attached Images Attached Images
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    Aluminum Oxide is another "blasting" media that can give a very fine, smooth "dulled" finish similar to the Kahr pistol "dfariswheel" shows. Again, as others have stated, the material used and the grain size of material and air pressure can vary the finish with any media.

    Using Aluminum Oxide with a fine grain and low pressure looks very nice on a blued firearm. The surface is smooth and does not reflect light, but the slight "roughness" make it hold oil very well too.
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    The early Remington Rand 1911A1 pistols were blued over a sandblasted finish. The sandblasting was not aggressive, leaving a soft matte finish.


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    I always enjoy seeing "JohnnyP" firearms, they are gorgeous!

    I have one Remington-Rand from mid-1944 showing a similar finish as "JohnnyP" pistol. The surface is blasted, but with a fine media which allows a nice looking "war" finish, yet is attractive. My picture is not as good, but here is mine.

    RR_45_02.jpg
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  8. #7
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    You can find a pretty good discussion of this on the sig forum. It goes into a lot of detail on the various finishes that can be obtained and different media and pressure results.
    greyman likes this.


 

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