Help diagnosing runs in powder coat

[R-mm]

I have been having good success powder coating using media from prismatic powders and and Eastwood dual voltage gun. This oil canister was a bit unique in that I really wanted the interior to have a solid coating so I probably went on the side of two much powder everywhere. I got these river like runs on the outside of the part which was otherwise perfectly smooth before hand. Does this look like a case of too much powder?

 

[R-mm]

I just remembered that I knocked the part over while I was spraying it and then kept going and sprayed over the parts that were a bit messed up. Maybe that has a lot to do with the ripples


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[ChrisLS8]

That's oil seeping out from the heat, any time you do anything that was in contact with oil such as that canister or valve covers it's a good idea to heat it out in the oven for an hour or two before cleaning and blasting/sanding/whatever prep you use.

I highly recommend plain ol acetone for wiping parts down as I did custom coating for about 10 years

 

[R-mm]

I did preheat it to cook out oil but only about 20min. Gave it an acetone wipe too but hard to get the inside clean 100%


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[Wileel]

Agree...looks like its not bonding well causing it to run...either that or its too thick in those isolated areas. If you are going to redo it see it the paint will scrape off in that area, if you dont want to recoat sand it smooth and hope for the best

 

[ovrrdrive]

Doesn't look like an outgassing problem to me... Could be oil under the powder. After you strip it down clean it really good with something strong like acetone, then hot soapy water, then acetone again and outgas at a higher temp than you're going to cure at for an hour or so then try again.

Stripping that is going to be a ***** unless you know someone with a b17 tank...

 

[ChrisLS8]

Yeah it's just the oil seeping out, at this point you should be good to sand the runs out and coat it again

 

[R-mm]

Ok ill try that. Ive yet to do a second coat on any part so this will be an experiment.


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[R-mm]

Do you guys think this is essentially a visual flaw or that it will fail very soon? I may just put the part in to service and see how bad it gets over time...


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