I used this neon red from Ace hardware, it sprays to a flat finish the I used some urethane clearcoat over it. They have green, yellow, orange, red neon spray.
Sorry I forgot to tell you the same thing ,white base first for best result but you can use other colors for different effects. Pearl white is a good one .
they have the neon powder,2 ounces for 7 bucks. mix it with klasskot clear,shoot over klasskote white,or klasskote white primer. my method for 15 years