Thank you for all of the kind comments.
On this build, I simply brush them over a satin coat. I'm not sure how it will work, on gloss coats or flat coats. However, this is just my method. I will attempt this on a gloss coat, after I'm finished with this build. I heavily reduce oils, with sansodor(though I imagine turpentine or mineral spirits will work). Capillary action will draw the paint, into the creases and crevices. What little residual paint is left helps tint the surround paint, without drowning the pin wash. Or you can simply remove it with a cotton swab. I will see if I can post a step-by-step, with photos. It took me a few attempts to achieve acceptable results.
All of the visible pin wash, on this build was done with this method. I did outline a few details, with a ready wash, but not in the photos posted.
Today, heavy weathering and road gear. Pictures to follow.