Copper pigment

Talk Composites - The Forum for Advanced Composites

Back

Copper pigment

Author	Message
Benmorrall	B Benmorrall posted 6 Years Ago HOT Topic Details
B Group: Forum Members Posts: 2, Visits: 4	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.
	Reply Like 6
Warren (Staff)	Warren (Staff) posted 6 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 7.9K	Hi, Sounds like the copper is sinking to the bottom and thus when you sand it , you are not exposing enough copper to get a metallic effect. As it is only 1.5mm deep you can massively load the resin with 2-300% copper by weight to ensure there is no where for the copper to sink to. Alternatively, brush on a thin surface layer again heavily laden in copper which once cured will only need a light sanding to expose the copper. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
	Reply Like 6
Benmorrall	B Benmorrall posted 6 Years Ago HOT Post Details
B Group: Forum Members Posts: 2, Visits: 4	Hi, thanks for your reply, I’ll load it up and try again, cheers.
	Reply Like 6
Fasta	Fasta posted 6 Years Ago HOT Post Details
Group: Forum Members Posts: 468, Visits: 3.5K	+x 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. Fastacraft Facebook page Edited 6 Years Ago by Fasta
	Reply Like 6