Do you want to paint on fake bricks or do you want to paint something so it looks like brick?
Where is the fake brick? Inside, outside?
Here's what we did with our fake brick panels to make them look more real:
Here's how I did it: https://www.unexpectedelegance.com/diy-brick-wall/
Here's my tutorial but I ended up using joint compound instead: https://withinthegrove.com/how-to-diy-faux-brick-wall/
Is it inside or out?
I painted this faux brick floor when I pulled up the carpet and realized I wouldn't be able to stain the concete. I used 3 slightly different colored paints, an extra large sponge, and acrylic paint to add the extra colors to make the brick more authentic. I sealed with concrete sealer. The grout lines are the original concrete slab.