Preventing silver discolouration when casting resin

I would like to combine some cold enamelling/ plique a jour in to my
silver jewellery. I have been reading ‘Resin Jewellery’ by Kathie
Murphy, where she warns about discolouration of silver when combined
with resin but does not offer a solution.The best I can find online
is:'Resin will discolor over time if in direct contact with silver.
Coat the silver with a clear paint before pouring resin on it.'Read
more: How to Use Epoxy Resin in Jewelry |

this is the best solution what ‘clear paint’ would be best? It must
not react with both silver and epoxy resin, and not weaken the bond
between silver and resin.

Thank you very much for
any help!