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Thread: Masking Tape just ate away KMR's Black finish?

  1. #31
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    Quote Originally Posted by Obscenejesster View Post
    Does anyone know why BCM just didn't use Cerakote for the color? Is it because they didn't want to add more time to the process by baking them?

    The only reason I ask is because I cerakoted my KMR and I've added/removed/moved accessories all up and down the rail without any color removal.

    I would love to know what BCM used for the color. Also, maybe it's not the coatings fault. Maybe it's normally durable but when applied over the Plasma Disposition process, it doesn't stick well.
    The problem is the inside of the handguard. The method we use now is able to deposit a color coat on the entire surface of the part inside and out. The baking wouldn't be a problem for us at all, it's the time taken to try and detail the inside of the parts.

    The other consideration when it comes to using spray-on coatings is the variance in thickness. On one project I ran in the past, we had a coating variance of more than .003" which takes away usable tolerance in the machining operations. We wanted to avoid that if possible because we pride ourselves on very precise parts. This is one of the reasons we have one of the best lockups to the barrel nut that you'll find (not to mention the clamping method).

    Luckily, the 'white' you see under the top coating is still very much protected and is an excellent base for paint. We're looking into what could have caused this and trying to ensure that we don't have repeats in the future. It's worth noting that a tape adhesion test is standard fare for coating tests (in addition to others) and ours are tested on every manufacturing lot, we've not had any issues to date. As such, I suspect the solvents in the paint might be a contributor here.

    As always, if you're dissatisfied, get ahold of BCM customer service.

  2. #32
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    Quote Originally Posted by markm View Post
    That's what I'm thinking. I'll admit though... I'm not willing to put a piece of tape on my rail to find out.

    I guess I could try it, but if something happened I'd have to be honest and feed the chicken little sky is falling crowd. I really don't want to foster that nonsense.
    Part of coating adhesion tests is actually to use a diamond scribe to penetrate the coating, and then use tape to ensure the coating doesn't peel any farther. I'd have to dig up the actual standard that describes it, but I'm away from my work computer at the moment. We use this test on every lot to ensure that the coating(s) are adhering adequately and have had no issues. Assuming something else hasn't compromised the coating, there should be very little to no increase in the size of the 'white' spots. We used a very low threshold as far as the 'growth' of the scratch is concerned when developing the coating(s).

  3. #33
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    Quote Originally Posted by Phreakish View Post
    The problem is the inside of the handguard. The method we use now is able to deposit a color coat on the entire surface of the part inside and out. The baking wouldn't be a problem for us at all, it's the time taken to try and detail the inside of the parts.

    The other consideration when it comes to using spray-on coatings is the variance in thickness. On one project I ran in the past, we had a coating variance of more than .003" which takes away usable tolerance in the machining operations. We wanted to avoid that if possible because we pride ourselves on very precise parts. This is one of the reasons we have one of the best lockups to the barrel nut that you'll find (not to mention the clamping method).

    Luckily, the 'white' you see under the top coating is still very much protected and is an excellent base for paint. We're looking into what could have caused this and trying to ensure that we don't have repeats in the future. It's worth noting that a tape adhesion test is standard fare for coating tests (in addition to others) and ours are tested on every manufacturing lot, we've not had any issues to date. As such, I suspect the solvents in the paint might be a contributor here.

    As always, if you're dissatisfied, get ahold of BCM customer service.
    Cool. thanks for the info. I'm definitely not dissatisfied with the KMR. It's the best damn handguard I've ever used and I'm looking for an excuse to buy another. I also agree that the lock up/clamping method is the best I've seen. It's extremely easy to install and it kinda makes me wonder why nobody else has thought of it.

    In my personal opinion, I think the KMR is the best handguard currently on the market.

  4. #34
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    Quote Originally Posted by Obscenejesster View Post
    Cool. thanks for the info. I'm definitely not dissatisfied with the KMR. It's the best damn handguard I've ever used and I'm looking for an excuse to buy another. I also agree that the lock up/clamping method is the best I've seen. It's extremely easy to install and it kinda makes me wonder why nobody else has thought of it.

    In my personal opinion, I think the KMR is the best handguard currently on the market.
    Definitely appreciate the kind words.

  5. #35
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    Quote Originally Posted by elephantrider View Post
    My understanding is that Cerakote was not used because it really doesn't lend itself to production type manufacturing. Cerakote is very sensitive to part preparation, paint application, and the baking that is required. If any one of those is not done correctly then the Cerakote will be bad. It is more suited to one-at-a-time type application than getting parts out in quantity.
    - Edit - saw Phreakish's answer above.
    Last edited by tonyxcom; 06-09-14 at 21:03.

  6. #36
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    Thanks for that info Phreakish.

    I did not make this thread to complain, I was also not very concerned but just surprised that tape took the finish off.

    All in all, I am perfectly happy with the KMR.
    It is from the construction of underground FEMA camps. I can't say more because there a guy parked in front of house in an AMC Pacer. He is acting like he talking on the phone, but I know better.

    I have to sign off now & put my laptop in the microwave.
    - cqbdriver

  7. #37
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    Very cool. Always interesting to read what goes into the gear we use.
    "You people have too much time on your hands." - scottryan

  8. #38
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    My KMR finish could wear off and show a gay pride rainbow underneath it, and I'd still run the piss out of it. I like it that much.

  9. #39
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    If I had to tap it on with a plastic faced hammer the end of the sight rail is where I would hit it. My tapping broke the surface tension of the coating and the loose flake just sat there waiting to be pulled off by the tape. How's that for a wild guess? GH

  10. #40
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    Quote Originally Posted by graffex View Post
    My KMR finish could wear off and show a gay pride rainbow underneath it, and I'd still run the piss out of it. I like it that much.
    That's true.
    "You people have too much time on your hands." - scottryan

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