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Old February 1, 2016, 10:19 PM   #1
Sheepfarmer
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Paint for a heatshield

I want to try designing my own heat shield out of some .080 or .125 mill finish aluminum and mill it on my CNC. Does anyone know what primer and paint to use? I want a flat black. Thanks
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Old February 1, 2016, 10:40 PM   #2
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I would think that any product made for painting engines or BBQ grills would be suitable.
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Old February 1, 2016, 11:27 PM   #3
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Thanks John
Do you think aluminum would make a good shield?
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Old February 2, 2016, 12:35 AM   #4
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I don't really know. The only barrel heat shields I have personal experience with have an internal metal shield with plastic or wood where the shooter's hand might make contact.

Most of the easily available information on heat shields is related to automotive applications and the requirements seem to be slightly different than heat shields for firearms.
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Old February 2, 2016, 05:01 AM   #5
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VHT paint would probably be the most durable. Available at all autoparts stores. You might even think of powdercoating.
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Old February 2, 2016, 08:26 AM   #6
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IIRC, Lowes/HD folks should carry a paint designed for woodstoves (at least in colder climes). That would work
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Old February 2, 2016, 11:54 AM   #7
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This is a thrown together design with slots instead of round holes. I will refine the cut file before cutting it on the CNC. I guess it couldn't hurt to try one made of aluminum. Thanks for the help with the paint!
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Old February 2, 2016, 05:56 PM   #8
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Ok I tried my pattern on a small piece of .080 aluminum and sprayed with some Derusto heat resistant paint. Now I'll bring the shotgun here to the shop, carefully measure it and design one to fit. I just have to figure the best way to roll the metal small enough to fit the barrel and stand off it about 1/8".
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File Type: jpg downsized_0202161638.jpg (191.2 KB, 26 views)

Last edited by Sheepfarmer; February 3, 2016 at 10:45 AM.
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Old February 3, 2016, 01:18 AM   #9
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Looks pretty good! Will you be able to make it roll evenly with the cuts in it?
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Old February 3, 2016, 10:44 AM   #10
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Thanks John
Not sure, but I'll give it a whirl. I'm thinking that the smaller holes in the center may cause a problem with that. If so, I will just eliminate them and possibly lengthen the angled ones on the sides just a tad. I'll post photos when it'd done.
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Old February 3, 2016, 02:16 PM   #11
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I'm hazy on this though sometime in the past, while doing a search for something else, I seem to recall seeing information about painting aluminum. It was suggested to do sort of an acid wash, essentially a vinegar solution to remove deep seated corrosion for better paint adhesion.
A google search for prepping aluminum to paint, or something similar should be helpful.
You might also look at the feasibility of anodising.
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Old February 3, 2016, 02:46 PM   #12
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The standard primer for aircraft aluminum was zinc/chromate. Kind
of a yellowish-greenish color. Been a long time, but I don't remember
any surface prep other than clean and grease free.
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Old February 3, 2016, 03:23 PM   #13
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Thanks!
I will check those out.
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Old February 7, 2016, 02:59 AM   #14
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Anodizing or hard anodizing would be a good choice.

Some people like barbecue grill paint or high-temperature engine paint for their guns.

Powdercoat would also be an option.
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Old February 15, 2016, 11:28 AM   #15
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Thanks!
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