Mdf Primer Do You Prime MDF If The Paint Your Using Has It Added Already,new MDF That We Are Making Shelves Out Of?

Do you prime MDF if the paint your using has it added already,new MDF that we are making shelves out of? - mdf primer

We just finished Gour Paintin huge living room and now we are shelves and coat in the same room, shows all design the use of MDF, so that we are well .... but we have no idea if you do not need a primer before painting or not, and if the paint was still recover it with this first? The MDF is new is that we need to cut and put together ... Thanks in advance!