If you don't like fingernail polish, I've used gold flake craft paint from Hobby Lobby for a more vintage look.
No one being covered by your gun in a legit def situation is gonna challenge your choice of front sight color. :-)
Try several. See what works for you. They're like a buck a piece. Acetone will remove almost anything except factory blue. It won't hurt stainless either. Just add some oil after rubbing with acetone to prevent flash rust.

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Chris
SWCA #2243 SWHF #292