if it is the floors, go to Lowe's and get the Quickcrete 1 or 2 part epoxy paint. They can mix most any color or it comes in a concrete color dark or light gray and white. I have used it many times before works great, just needs a 3/8 nap roller and 2 coats! don't forget to etch the concrete first. If it is the walls def. go white or an off white.
I am using the grey Rustoleum solvent based 2 part epoxy.
that part looks good. the floor was degreased, shotblasted, then etched. so I don't think I will have any adhesion problems with it.
I figure in a couple years if it wears down I will do the pour method with some Ucoatit product.
the walls are my next project, but I think I am going to be doing some rewiring first. There was only one 15A run in the garage.. Between Brighton, my father, and me, a 20A run was made.
but I think a bit needs to be improved for it to be a "real" shop.
but at least I can get the floors done well before any cars or stuff gets dumped on it again.
*EDIT* Pix added here and at the top