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Just wondering why you are using ORACAL 651. A brief search didn’t turn up any other postings or web articles using this material for cold transfer. Paper products are exclusively used as far as I can tell. The solvent readily penetrates the paper and after it dries, soaking in water makes it easy to remove while leaving the toner on the copper.
Mike N.
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Thursday, October 06, 2016 6:55 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Cold toner transfer FAILURE
Tried another transfer using ORACAL 651, using a mixture of half
acetone and half denatured alcohol Followed Harvey's directions
and burnished the artwork backside with the backside of a fork
following DuWayne. The artwork did not transfer.
Tried it again with the same mixture. This time I put the copper
clad board between two steel plates that I marked with a red Sharpie.
I squeezed them together for ten minutes using two medium C clamps.
This time about a third of the toner transfer from the artwork to
the copper clad--in the middle of the board. PARTIAL SUCCESS...
Next time, try applying pressure with a pipe clamp. Better yet,
get a 6-inch brayer. I see the brayers come in either hard rubber
or soft rubber. Which kind did you get, Harvey? I've never used one.