Hi!

In my experience most epoxies will stick extremely well to almost any clean dry concrete surface, and even dirty dusty ones as well (my workroom floor shows almost all the colours of epoxy I have dripped onto it while making moulds and parts

I would inject the gold epoxy with a large syringe, and simply wipe off the excess on the surface with a cloth soaked in alcohol

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I'm trying to insert 'gold' epoxy resin into small concrete cracks on a polished concrete floor and would welcome advice on how to insert it, how to prime it and any basic 'how to' tips.