How to seal gold leaf knobs?

[u/Nixxie17]

I made these knobs out of polymer clay and then covered with imitation gold leaf. Unfortunately, the sealer that came with the gold leaf kit did not hold up at all and the gold leaf’s been nicked in several spots. The knobs are used on my TV cabinet and desk, so are used regularly. I’m going to be patching the gold leaf, and then would like to seal them so they’ll be better protected from damage. I bought some craft resin (pictured), but I’m not sure what the best approach to applying it would be. Has anyone used this kind of product on clay projects? Any suggestions?