Painting Brick Floors The Right Way. ... Once you've sealed the brick, apply one to two layers of primer such as Behr ...

Behr Porch & Patio Floor Paint, which seems to be the type of product you have in mind, will not stick to sealed concrete, even with a primer. However, Behr’s 1-Part Epoxy Concrete & Garage ...

Then you can paint with a product designed for exterior concrete, such as Behr Premium Plus Porch & Patio Floor Paint. All of the above is fairly standard advice, so your painters may have done that.