I’ve used ‘Dayglo’ out of rattle can’s in the past.
Very bright and not too heavy as you only need to mist it on, and touch it up now and then.
You MUST have a white background though to put it over—-tissue, Polyspan etc. etc.
Lots of bright colours available too
red’s, orange, yellow, green etc.
I really don’t like it just sprayed at random on the tips though. Looks messy. It looks much better masked off in a bit on the tip in a nice straight line to keep it neat looking. 🙂