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Thread: WHAT DID I DO WRONG/HOW DID I MESS UP?

  1. #781
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    Quote Originally Posted by weaselchew View Post
    http://www.powderbuythepound.com/ALUMINUM_BASECOAT.html
    http://www.powderbuythepound.com/CRY...OSS_CLEAR.html

    They are both polyester. The clear wasn't put on immediately, it was a few days to a week later.
    The long wait could be a contributor, but I still lean toward under cure after looking at the powder descriptions. Knowing they're both Polyesters, probably eliminates the incompatibility pretty well.... I don't think I've ever waited to shoot a second coat that long.... Something to try one day.

  2. #782

    Angry what did i do wrong/how did i mess up?

    im new to this forum and powdercoating..hello im coating valvecovers, i used cryscoat to the parts then ogf grey primer coated perfect,then did the second coat with ss black wrinkle thats when i mess up....had a good ground and turned down the kv's and i was getting alot of round circles popping out the powder...but if i took a bare valve cover and coated it with black wrinkle without primer had no problem....please help im pulling my hair out...lol

  3. #783
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    Quote Originally Posted by harrison32 View Post
    im new to this forum and powdercoating..hello im coating valvecovers, i used cryscoat to the parts then ogf grey primer coated perfect,then did the second coat with ss black wrinkle thats when i mess up....had a good ground and turned down the kv's and i was getting alot of round circles popping out the powder...but if i took a bare valve cover and coated it with black wrinkle without primer had no problem....please help im pulling my hair out...lol
    Probably not truly a good ground.... This is not unusual on subsequent coats. You need to make a clean bare spot to ground to again, after curing the first coat..... use a small round file (I good use for that little chainsaw file) usually will do the job. Just make sure the hook isn't interrupted by powder where it was hung on the first coat... sometimes the powder will melt in between the hook and thepart (Actually this is more common than not), and cause the issue you're having. The spots that are popping out are back ionization, and are caused by excessive charge on the surface of the first coat of powder, because there's no path to ground due to the aforementioned melting between thing.... Clean it up, and re-shoot. You'll be fine.

  4. #784
    thank you,that worked perfect

  5. #785
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    Quote Originally Posted by harrison32 View Post
    thank you,that worked perfect
    At Last! Someone listened instead of trying to bypass the way to make things right! This makes me very happy, and Smiley!

  6. #786
    Interesting and valuable information.

  7. #787
    Super Moderator LennyRound's Avatar
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    Good Stuff! We see that happen in the class room from time to time. That is a great answer and right spot on for the fix... Good call on the Ground.
    LENNY ROUND Forum Super Moderator, Technical Rep., R+D, Instructor.
    SpectraCoat Snap And Match
    615-776-7600 www.powderbuythepound.com


  8. #788
    New on here but have been lurking for a long time.

    Now the problem. Did some valve covers with PBTB pearly grapes color and it came out textured, not smooth. Surface was clean and perfect for coating, had very good adhesion, etc. Pre heated covers too. It just seemed like it didn't want to flow out.

    But actually I went with it because it looked pretty awesome.

    But anyway, why did this happen? I have one more part to do in this color but I don't want this textured look on it.

  9. #789
    Super Moderator LennyRound's Avatar
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    Hi sapper,
    Well my friend I don't think you did anything wrong with The Pearly Grapes Powder. I took a look at the picture and clicked on Zoom, on our website, and it seems to look the same as the sample panels.
    Here's the link http://www.powderbuythepound.com/THE_PEARLY_GRAPES/
    If you want to go with a shinny-er gloss then I would use http://www.powderbuythepound.com/CRY...H_GLOSS_CLEAR/ or http://www.powderbuythepound.com/SUP...EAR_STARLIGHT/. Both of them will make your parts POP.
    LENNY ROUND Forum Super Moderator, Technical Rep., R+D, Instructor.
    SpectraCoat Snap And Match
    615-776-7600 www.powderbuythepound.com


  10. #790
    Quote Originally Posted by SCOTTRODS View Post
    Probably not truly a good ground.... This is not unusual on subsequent coats. You need to make a clean bare spot to ground to again, after curing the first coat..... use a small round file (I good use for that little chainsaw file) usually will do the job. Just make sure the hook isn't interrupted by powder where it was hung on the first coat... sometimes the powder will melt in between the hook and thepart (Actually this is more common than not), and cause the issue you're having. The spots that are popping out are back ionization, and are caused by excessive charge on the surface of the first coat of powder, because there's no path to ground due to the aforementioned melting between thing.... Clean it up, and re-shoot. You'll be fine.
    This sounds like a solution to a problem I had today after shooting my second coat over primer,been pulling my hair out looking for answers and hopefully this advice should help,will let you know how I get on when I re-shoot tommorow

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