I think resin-based glazes that cure hard are the way to go. Acrylic varnish, acrylic medium and polymer clay glazes are just too soft and not durable in the long term. I've used a brush-on resin nail glue for small projects but I'm looking for a resin gloss but not one that requires a UV lamp, next. Maybe Magic Glos? For bigger projects you can use two part resins like polyester, acrylic etc but it makes no sense to mix them for smalle things.