Wandering through the local Farm-Fleet store today I came across a Sharpie display with a white marker -- Sharpie Mean Streak permanent marking stick. Sharpie part number 85118, price $3.69. I thought it was a white ink marker but it turns out to be a soft solid paint stick. Used like a crayon but very lightly, I got a nice opaque surface that took pencil and ink very well. Used too heavily, I got a nice opaque surface that would chip off easily during layout with a pencil -- not what I was looking for, so a very light application is needed. Takes a few minutes to dry and appears to adhere best to a degreased surface. I did a successful transfer from Epson transparency film as well, but I prefer the Transfer Magic solution for best results.
Gary
Gary