There are some great ideas here: https://www.pinterest.com/explore/painting-formica/
Are you painting formica countertops? Here are some posts on Hometalk that will help: https://www.hometalk.com/search/posts?filter=paint%20formica
You didn't mention what you want to paint, but here's an article about painting a Formica countertop. The instructions would be basically the same for other Formica items. Wishing you the best.