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Clear coating on copper

Posted: Mon Apr 01, 2024 7:31 pm
by TheBaconLard
I’m currently waiting on some copper to build my first still. I’m pretty sure the copper comes with some sort of chemical clear coating to prevent corrosion or oxidization. Should I remove this on the side that will be facing inwards? How could I go about doing this?

Re: Clear coating on copper

Posted: Mon Apr 01, 2024 7:55 pm
by Yummyrum
What makes you think it is clear coated ?
I’d doubt it .
Most copper you see , sheet, pipe , fittings all look perfectly clean and not oxidised . It’s only when we touch them they start to go brown .

Copper sheet sold with the intension of being processed by welding or soldering would be a nightmere to use if it was clear coated

Re: Clear coating on copper

Posted: Mon Apr 01, 2024 10:39 pm
by NZChris
The only clear coating I've had on copper is a plastic protective film that easily peels off.

Re: Clear coating on copper

Posted: Tue Apr 02, 2024 1:26 am
by Saltbush Bill
I'll third that, I've bought and built with quite a bit of copper, never seen it coated.

Re: Clear coating on copper

Posted: Tue Apr 02, 2024 2:49 pm
by TheBaconLard
Thanks for the replies, I’m not exactly an expert on crafting stills so I was a little confused. Wish me luck!

Re: Clear coating on copper

Posted: Tue Apr 02, 2024 4:13 pm
by jonnys_spirit
TheBaconLard wrote: Tue Apr 02, 2024 2:49 pm Thanks for the replies, I’m not an expert yet on crafting stills so I was a little confused. Wish me luck!
There - I fixed that for you and good luck. Pay it forward some day some way ;)

Cheers,
jonny

Re: Clear coating on copper

Posted: Tue Apr 02, 2024 5:15 pm
by shadylane
Saltbush Bill wrote: Tue Apr 02, 2024 1:26 am I'll third that, I've bought and built with quite a bit of copper, never seen it coated.
Copper sheet might have a protective peel off layer. Think the good stuff meant for fancy work.
It also might have a layer of clear coat just to make it pretty.
When in doubt, look, research and ask.

Re: Clear coating on copper

Posted: Tue Apr 02, 2024 7:47 pm
by Saltbush Bill
shadylane wrote: Tue Apr 02, 2024 5:15 pm When in doubt, look, research and ask.
Very true Shady, best to play it safe, it can't hurt to ask the retailer or manufacturer.
Different things could well apply in different locations around the globe.

Re: Clear coating on copper

Posted: Tue Apr 02, 2024 10:43 pm
by NZChris
I've only come across clear coat on finished products, not on sheet. Heating a corner to red hot should tell you if it has any sort of coating.

Re: Clear coating on copper

Posted: Wed Apr 03, 2024 5:54 pm
by shadylane
NZChris wrote: Tue Apr 02, 2024 10:43 pm I've only come across clear coat on finished products, not on sheet. Heating a corner to red hot should tell you if it has any sort of coating.
Trial by fire NZ :lol:
If it was clear coated. Scotch bright and water after annealing.
Be gentle with the annealed copper--it's butter soft and ready for shaping.

Re: Clear coating on copper

Posted: Wed Apr 03, 2024 10:32 pm
by NZChris
I had to anneal the bottom of my still at least twice while shaping it to take an element at 45 degrees, which was then bent to horizontal to give me a very low element for small runs if needed. It was well worth the effort and I've done many small experimental runs with this still, even though it is the same one that I'm using to produce my bulk spirit for neutral and rum/whiskey/etc..