I have powder coated a lot of stuff and for the powdered paint to melt and fuse to the metal when the item is placed in the pre heated oven the surface temperature has to reach the melting point and remain there for a long enough period for the fusing to the metal. Because the NST is such a large mass and the tar will draw the heat away from the metal you are going t have a mess. I suggest using Eastwood’s car ceramic based undercoat paint. It’s almost as tough as powder coating without all the hassle.
Allen Bishop
Colorado Springs
Sent from my iPad
> On Jan 16, 2019, at 6:10 PM, Bart Anderson <gort@xxxxxxxxxxxxxxxx> wrote:
>
> Hi Jeremiah,
>
> I have de-potted a couple NST's by setting an electric stove top burner onto a large coffee can and the NST on top of the burner. Stove tops get to roughly 350-400ºF and the tar does melt. When it does, the tar will ooze out of any opening such as the LV and HV bushings. But, it takes a while at that temp to get the tar melted and I don't think 20-40 minutes in the powder-coat oven is going to melt it fast enough. But, it's a risk. As someone already said, if you can put a dead NST through it first, you might save yourself an oops.
>
> Take care,
> Bart
>
>
>> On 1/16/2019 6:47 AM, Amnite Ascended wrote:
>> Sorry if your first thought was, "Jesus man.... Millionth time...
>> Fragile...."
>>
>> Anywho. So I want to see if a whole, working, NST will survive getting
>> powder coated. My main concern is the windings insulation.
>>
>> For those unfamiliar with the process, here is a quick overview.
>> The NST will get sandblasted. Then hung on a rack. The rack and NST will
>> then be grounded. The powder is charged so it easily sticks to the grounded
>> object. Then the NST will be heat treated to melt and bond the powder. This
>> is sticking it in an oven for 20-40 minutes, at temps between 325-425 f.
>> Lugs will of course been protected. The tar smell/smoke shouldn't be an
>> issue.
>>
>> I've never unpotted one of these, so seeking the experiences of the list.
>>
>> Thanks,
>> Jeremiah
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