Does White Primer exist

I know you can buy Gray and Black Primer, but does White primer exist.

     When I get my 87GT together it just dawned on me that it is going to be 3 different colours until I get it painted.  I am going to need to sand and primer it regardless in order to get all the re-painted panels to come out looking the same shade, I figured I might as well, primer the panels in the final colour that I plan to paint it.  Which will be Black Body with White trim.

          Awesome and even a brand I like.  I have had excellent results with Plastikote.    Once I get the suspension on and the car on the ground, I'll start the sanding procedure. 

Thank You.

Ok John you know enough about me to know that I know NOTHING about paint and prep, my idea of prep was grab a shop towel wipe off the dirt, and shoot it. (hopefully the shop towel was not too dirty/greasy) 

I thought using catalyzed paint was bad for a Fiero and made it almost un-paintable afterwords?  I am really confused now. 

        All I want to do is make the panels semi match while not ruining them for a real paint job that will be done later on.  I have been told by many sources my "spray bombs" that I have been using on the car many years ago, made the panels useless.  Which is one of the reasons I am changing out any of my spray bomb panels for good raw panels.

         I'll have to have you explain it on the phone to me.   Looks like I am going to have to finish the car by Saturday night as the rain is suppose to roll in on Sunday which means no more working on it outside. 

          On a related note, I put on the black GT bumper skin, and it is totally out of shape and does not seem to line up.   Any suggestions on how to get it back into proper shape aside from forcing the skin to where it needs to be then heating it with my heater?   It sat in the sun in a pile of body parts then got snowed on, then more sun, then finally I dug it out of the pile and it is twisted.  I was also thinking about hooking up the Hot Water tap in the laundry room and washing it down with Scorching Hot Water to soften it up so it will re-form to where it needs to be?  You think that will work.