Should cinder blocks be sealed before painting? What would you seal them with after painting?
Patty, since cinder blocks are so very porous you'll want to paint them with a
an acrylic primer which will fill the pores of the blocks and give you a smoother finish. Apply the primer generously with a thick nap paint roller. You can then paint them with an acrylic paint in the color of your choice.
Are you using them inside or outside
Most of these videos are for painting cinder block walls, but there are some that are painted in decorative ways. Have fun with it, Patty!