Talk Composites - The Forum for Advanced Composites

Copper pigment

http://www.talkcomposites.com/Topic25668.aspx

By Benmorrall - 4/10/2018 7:58:50 AM

Hi, I’m making an acoustic guitar and wanted a copper looking inlay around the sound hole.
I have routered a 120mm diameter ring, 6mm wide by 1.5mm deep and poured clear cast epoxy mixed with the copper pigment in. However when it’s dry and I scrape/sand it just stays a dull brown colour.
There are small parts on the overspill that go a bright copper finish, but the inlay doesn’t.
Any help would be much appreciated, many thanks.
By Fasta - 4/10/2018 10:06:10 AM

 
Benmorrall - 4/10/2018 9:22:40 AM
Hi, thanks for your reply, I’ll load it up and try again, cheers.

I have made some copper effect parts from polyurethane resins with real copper powder additives.
To get a super loaded copper effect at the surface I spayed my moulds with an aerosol release agent called stoner and this is kind of greasy and thick as it does not really dry off. Then immediately we threw the copper powder onto the release agent and it sticks there. Then we cast our parts.

The one problem it can have is that when the parts are cast any constant flow of resin over any one area can wash the copper away so you have to be careful of this too. Should work with other resins. Then rub the surface after it's demoulded and you get real copper.