Thick paint

The floor paint is thick as mustard, and the paint roller tends to skid in the tray and on the concrete. I don't think a paint sprayer would do much good with stuff this viscous, and I don't care to use one indoors anyway. Maybe the best thing is to use a wide brush instead. It can't be much slower.

Yes, I washed the floor several times--soap water and rinse. And vacuumed with a HEPA machine. I'm emptying shelves and washing the contents, then the shelves, and then painting the wooden shelves. I figure I can get the plastic and metal clean, but concrete and wood have pores. I want it clean enough for grandkids.