Joe, Sorry I haven't been on the forum in a couple of days. Your coloring and weathering is getting very good. The last 2 steps I did to the wall in that earlier post was to apply "mortar" just like a plastic molded brick building....
I use the "Lightweight" patching spackling compound and pieces of those flexible promotional cards you get in the mail for an applicator. Keep small cut up pieces of common cheap kitchen sponge damp with a small container of water to rinse it out and clean off the mortar on the face of the blocks shortly after forcing it into the mortar lines with the flexible spreader.
I have better luck taking some of the lightweight spackling out the plastic container and mixing and spreading it on a piece of glass or plexiglass so I can get small amounts on the tool and not slobber it everywhere. It will slightly change the color of your blocks, so you may need to go back and touch some up.
You can also "tint" the white lightweight spackling with black or burnt umber acrylic craft paint.
And last recommendation, seal your block wall with in less expensive Krylon or Rustoleum Flat Clearcoat before you start spacking.. Same procedure as mortaring a plastic structure where you have painted the brickwork first... If you don't seal it, the water and spackling may pick up some of the acrylic paint colors and change colors on you.
Hope that helps.
