TimC
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| posted on 11/12/12 at 01:51 PM |
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Powdercoat and threads.
Hi All,
What's the collective thinking on covering male and female threads when powdercoating?
I was thinking about putting some cheap bolts with plumbers' tape into tapped holes and wasn't sure whether to cover male threads with
insulation tape or nuts.
Any views?
Thanks
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MakeEverything
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| posted on 11/12/12 at 02:04 PM |
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yes, cover them up. it galls inside the thread otherwise and makes it difficult to screw in and out.
ETA: if youre curing it with a heat gun, youll need high temperature masking tape.
[Edited on 11-12-12, by MakeEverything]
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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gremlin1234
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| posted on 11/12/12 at 03:00 PM |
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using bolts in the holes means you have to break the powdercoat as you take them out
use silicone bungs
quick search found this site (as an example)
http://www.bpfittings.co.uk/pc/High-Temperature-Silicone-Rubber-Caps-Plugs-c3146.htm
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adithorp
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| posted on 11/12/12 at 03:59 PM |
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Can't you just run a tap/die down them afterwards?
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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TimC
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| posted on 11/12/12 at 04:18 PM |
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quote:
Originally posted by adithorp
Can't you just run a tap/die down them afterwards?
That's the other option...
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FuryRebuild
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| posted on 11/12/12 at 04:44 PM |
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I also screw tight wads of blue tissue into the holes to protect the threads, or when it is (say) a hole not a thread, then the tissue will protect
it. It does tend to set rock-solid but a little wetting and it will come out.
Do not use gaffer/duck tape. the heat sets it solid and it takes some getting off.
I often just use a sacrificial bolt if it's not a hole.
When all you have is a hammer, everything around you is a nail.
www.furyrebuild.co.uk
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adithorp
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| posted on 11/12/12 at 04:55 PM |
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I've seen masking tape used on studs when powdercoating. Suprise me that it worked.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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FuryRebuild
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| posted on 11/12/12 at 04:57 PM |
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glad it works for something 
Duck tape has hods of adhesive, which runs then sets under the heat. I suppose that's the only thing in the universe it's not good for.
When all you have is a hammer, everything around you is a nail.
www.furyrebuild.co.uk
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TimC
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| posted on 11/12/12 at 05:03 PM |
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I'll probably just ask the guy doing it eh?
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FuryRebuild
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| posted on 11/12/12 at 05:07 PM |
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My experience of powder coaters is that they just get stuck in, and if it's not masked it should be coated.
Further tips - if you're doing something like a chassis best be sure you block every hole with something like a self tapper else the blasting
material will get in there, and there's no way to get it out.
When all you have is a hammer, everything around you is a nail.
www.furyrebuild.co.uk
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clanger
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| posted on 11/12/12 at 06:13 PM |
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another one for tap & die.........
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fullpint
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| posted on 11/12/12 at 06:15 PM |
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Hi Tim,
Masking tape is fine but I expect they will know that all threads need masking. Worth just checking with them first. Depends if they are putting the
powder on whilst the metal is hot or cold. If cold they can use an air-gun to blow the excess off 
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TimC
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| posted on 11/12/12 at 08:06 PM |
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quote:
Originally posted by fullpint
Hi Tim,
Masking tape is fine but I expect they will know that all threads need masking. Worth just checking with them first. Depends if they are putting the
powder on whilst the metal is hot or cold. If cold they can use an air-gun to blow the excess off
Shame someone doesn't have a bigger oven! I'm taking it to azcoat.co.uk
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owelly
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| posted on 11/12/12 at 08:51 PM |
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Tin foil for external threads and rolled-up newspaper for internal threads and holes.
http://www.ppcmag.co.uk
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eddie99
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| posted on 11/12/12 at 08:55 PM |
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+1 Re-tap every hole, i think considering the time involved, it'll be quicker to retap all the holes.
http://www.elitemotorsporteng.co.uk/
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bi22le
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| posted on 11/12/12 at 10:13 PM |
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The pro's use masking tape for external and silicon bugs for internal. Well the companies i use do.
If its a company they should automatically cover all threads as practice. Again, the ones we use do. We dont even tell them to.
If they miss one the tap and die it. You should not have to prep it. If its a company they will be dipping it and asserts anyway.
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
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907
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| posted on 14/12/12 at 08:47 AM |
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I picked up a rad to fan cowl that I made for an Austin Healey this week from
Internations in Sible Hedingham and had forgotten to ask them to block the M4 threadserts.
No worries, as they did it anyway. They made a nice job of it. Highly recommended.
The powder coat hid all my rough hammer marks a treat. 
Cheers,
Paul G
 
Rad to Fan transformation cowl
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