Spray a coat of primer onto the blocks. Make sure to thoroughly coat the cinder blocks so the pores are filled, also don’t forget to get inside the holes.
First sand all of the 4×4’s using an orbital sander and 220 grit paper, and then wipe them down with a lint-free cloth.
Lay the first 4 blocks at the distance you want the length of the bench seat, 2 stacked on each side.
First, make sure that everything lines up before gluing the side-facing seating blocks to the base.