Thank you very much, my friends! Bob and Ernie, the post-shading is indeed pastels. My usual method of application is to use a small sponge type make-up applicator. Very cheap and readily available at any pharmacy. They work great for pre-shading, but for post-shading you want something with a lighter touch, so I went with the method used by Paul Carpenter (Carpo) and used a small, soft bristled brush with a chisel tip.
Cheers,
Bud