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Candies > Me

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  • Candies > Me

    Ok, so for the life of me i CANNOT get candies work correctly...

    I did one VC that turned out good, except for one little crater and a couple defects in the base coat. So anyways, I was doing some parts for myself(good thing) tonight and I failed again. I was doing a VC, a compressor housing, and a throttle pulley for my throttle body. I blasted all of the parts, rinsed them with hot water, then outgassed at 500 for 30 minutes. I let the parts coo, masked them, then sprayed the silver explosion base coat. I cured the base coat and it actually came out pretty nice. After they cooled again, I put on the Trans Blue.... now this is the odd part. All of the parts were 100% covered and from what I could tell, pretty damn evenly. There were NO spots where I could see through the powder to the silver explosion. So I cure the trans blue, pull it out and I notice that there are placed where it looks like I missed a spot (remember I said I am CERTAIN I didnt?). So I hot flocked those spots lightly, saw that they were covered, once again, then cured again. Half way through the cure, I took a peak.... the same exact spots were BARE again... What am I doing wrong? I don't get it. It's almost like someone sprayed some PAM on my parts when I wasn't looking. But this can't be since I took the part right from the oven after the silver explosion, let it cool (I didn't touch the part at all), then sprayed the blue.

    Any suggestions? Heres some pics...





    You can see in this one, where I WAY over did the powder trying to correct one of the bare spots. (in the corner by the plug hole on the left)







    This one just plain looks like I mixed the blue 50/50 with the silver (definitely didnt, and I cleaned the gun thoroughly)








  • #2
    Re: Candies > Me

    to me from those pictures, it looks like you didnt apply enough powder

    confirmed in there too with the bare spot on the compressor housing.
    CHRIS
    Craved Coatings - Australia

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    • #3
      Re: Candies > Me

      Looks like there wasn't enough powder applied to those areas.what kind of gun are you using???

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      • #4
        Re: Candies > Me

        Originally posted by JW450R1
        Looks like there wasn't enough powder applied to those areas.what kind of gun are you using???
        Caswell 50kv. I dunno, I laid it on pretty thick. And what about when I hot flocked and watched it flow out and cover the area?

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        • #5
          Re: Candies > Me

          One other possiblity is the silver was undercured. I have noticed that certain basecoats will bleed through the topcoat if undercured. what time and temp did you cure the silver, and when did you start your timer? Do you use an IR thermometer?
          Dan
          sigpic

          I carry a gun because I'm too young to die, and too old to take an ass-whoopin'!

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          • #6
            Re: Candies > Me

            Originally posted by wiseguyz
            One other possiblity is the silver was undercured. I have noticed that certain basecoats will bleed through the topcoat if undercured. what time and temp did you cure the silver, and when did you start your timer? Do you use an IR thermometer?
            I put the part in with the oven at 275*, let the parts reach that temp and flow out for 5m minutes, then I cured at 400 for 11 minutes. I cured it an extra minute.

            And yes, I have a Fluke IR gun.

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            • #7
              Re: Candies > Me

              I think it looks like the candy is to thin.

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              • #8
                Re: Candies > Me

                Originally posted by Crimson
                I think it looks like the candy is to thin.
                Hmm, well maybe I'll scuff it up and shoot another coat. But I really think I had a good amount on there, especially after I tried hot flocking the spots twice.

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                • #9
                  Re: Candies > Me

                  Do a test sample on some junk and see hw it turn out.

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                  • #10
                    Re: Candies > Me

                    Originally posted by Crimson
                    Do a test sample on some junk and see hw it turn out.
                    Good idea.

                    Comment


                    • #11
                      Re: Candies > Me

                      Originally posted by Harleydad
                      Get yourself a led flashlight, it helps alot to find spots that may not be covered well enough.
                      That's great advice and exactly what I do. I picked up an LED mag-lite for QA/QC purposes. A lot of times when I coat something I will have my buddy shine the light at hard to reach areas and he will walk around the part a few times looking for light spots where the base coat or metal will shine through. The white light from the LED makes it really easy to spot areas that need more powder.

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                      • #12
                        Re: Candies > Me

                        Originally posted by Harleydad
                        Originally posted by Tonyklem
                        Originally posted by wiseguyz
                        One other possiblity is the silver was undercured. I have noticed that certain basecoats will bleed through the topcoat if undercured. what time and temp did you cure the silver, and when did you start your timer? Do you use an IR thermometer?
                        I put the part in with the oven at 275*, let the parts reach that temp and flow out for 5m minutes, then I cured at 400 for 11 minutes. I cured it an extra minute.

                        And yes, I have a Fluke IR gun.
                        I agree that it looks as if there's not enough powder.
                        I'll assume you let the part get up to 400 degrees. The way I read the above post is that put it oven @ 275, the parts reached that temp and you let it flow for 5 minutes. Turned the oven up to 400 and started the timer for 11 minutes with out getting the part up to 400?

                        Along with Wise's comments about the base being undercured, be sure you have a good ground. Start with the hard to reach faraday areas first. Get yourself a led flashlight, it helps alot to find spots that may not be covered well enough.
                        Sorry, I didn't make myself clear, I let the PMT get to 400, then set the timer. As far as a light, I use one of those halogen work lights and I walk it around the part, but I guess a white LED might work a little better.

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                        • #13
                          Re: Candies > Me

                          thanks for all the help so far guys

                          Comment


                          • #14
                            Re: Candies > Me

                            Originally posted by Harleydad
                            Originally posted by Tonyklem
                            thanks for all the help so far guys
                            That's what the "Family" is for. Keep us posted how things go with the test parts as well as the others.
                            Ok, so you guys were right, as usual . Here's the compressor housing.

                            From This


                            To This

                            The VC is still in the oven as we speak.

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                            • #15
                              Re: Candies > Me

                              And the VC:

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