I've been recommended to use oil-based polyurethane to keep the colour on heat treated copper. Can anyone tell me in what form I can buy this at a regular DIY store in the UK? Is there a trade name I'd be familiar with? Any help welcome please! Thanks.
Oil-based polyurethane
- Thread starter jdl
- Start date
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Polyurethane is used to give wooden surfaces a high clear gloss finish. It is very durable used this way. Though it probably has other uses. It is essentially a plastic protective coating. Go to B&Q and read their tins. Find them on the wood paint/stain/gloss aisle.
You will probably find a clear lacquer. It is often used on polished brass to prevent it from tarnishing, so you might find it among the doorknobs.
Lacquer tends to go yellow/brown with age so there are clear ones at higher price, but I don't suppose that will matter on copper.
Is this some kind of craftwork/repoussé? Some people wax it.
Lacquer tends to go yellow/brown with age so there are clear ones at higher price, but I don't suppose that will matter on copper.
Is this some kind of craftwork/repoussé? Some people wax it.
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Yes, its for copper jewellery that I sell that I don't want to tarnish or change colour 6 months after a customer has bought it else I'll get complaints and that's not good for trade!
When I heat it I get some lovely colours but all the laquers I've tried (and I've tried several) subdue those colours , especially the purples, too much which is disappointing. Someone suggested oil-based polyurethane (I thought most varnishes were water based but that may just be my ignorance) so I was wondering what it was.
I shall try your wax idea too - thanks.
When I heat it I get some lovely colours but all the laquers I've tried (and I've tried several) subdue those colours , especially the purples, too much which is disappointing. Someone suggested oil-based polyurethane (I thought most varnishes were water based but that may just be my ignorance) so I was wondering what it was.
I shall try your wax idea too - thanks.
The most durable wood finishes/treatments are oil based, i'd expect the same to be true of any protective treatment. Polyurethane wood protector that i've used in the past is like a jelly, very very thick.
You could try asking a local / high st jewellers what they use, see if you can scrounge a pot for free
You could try asking a local / high st jewellers what they use, see if you can scrounge a pot for free
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