Really sorry to see that your first post on Workshop didn't receive a reply during my absence from the community. Let me tag @MitchellM in the hope that he can assist you with your question about using an oil-based varnish.
Let me also extend a very warm welcome to Workshop. We're pleased to have you join in the discussion and trust you have been inspired by Mitch's wonderful work. Please feel free to post anytime you need a hand or have something to share with our members.
@madmonkeys Sorry for the delayed response, I don't see why it wouldn't. Because there are so many mediums in play here, crayon/epoxy etc. It's always best practice to do a test section before potentially ruining a project.
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Just a bit of FYI - though Chris came to it independently - he isn't the first to have the crayon idea. People have played with this since before the internet - I lived near a woodworker in country NSW who did some décor pieces with crayon inlay, back in the 80's sometime.
I believe there was a discussion in a woodwork magazine forum about it... maybe 2010? or thereabouts.
It crops up fairly regularly - some one always says "I know! Why don't we try..." lol.
Hard to give credit for ideas that have been floating around in the ether for years. You never know what you might subconsciously pick up that leads to your Eureka! moment.
Yes I have seen crayon work around since I was a kid, and that was a while back. My eldest now in her 30's did work melting crayons in craft and art work when she was in primary school. So it's deff not a new thing.
This old Gal