Concluding Herbert Rogoff's 1969 interview from American Artist magazine...
HR: Commercial artists have to develop tricks for the purpose of saving time, and also for meeting the problems of reproduction. What are some of yours?
SK: Well, my biggest problem had always been trying to save my drawing or painting after I found I didn't like the way it was going. In washing it out, I lost not only today's painting, but yesterday's and last week's as well.
SK: I've overcome this by using a crystal clear spray to isolate my drawing. I start my picture by projecting my sketch onto my illustration board and then using pen and ink to draw it in. After my drawing is finished I spray it.
SK: I'm not restricted to India ink, mind you, I can also use water-based materials such as the felt tipped watercolors. In this way I can do drawings in colour without any real problem.
SK: Once having sprayed the surface, the next problem is trying to paint over that glazed surface. To start this I use a polymer matte medium, diluted with half water, which I brush over the area.
This is a very thin coat because I don't want to build it up to the extent that I find it beginning to peel away. Once the matte medium is on, I have a surface on which to paint in gouache.
SK: Then if I'm not satisfied - if the gouache painting comes out wrong - my escape hatch is a sponge and water to wash it off the isolated drawing. This is why I don't use the polymere colors - I'd never be able to wash them off. Although my painting is no longer in existence, my drawing, isolated under coats of plastic, is completely intact - I haven't lost it at all.
SK: Once I'm satisfied with my painting, I spray over this stage. Again, I've got to go through the process of using the matte medium, but it permits me to come back to this second stage if I'm in trouble.
SK: Not only is this a safety measure for me, but I can see the doors open as far as technique is concerned.
SK: It's very important for me to have complete control...
... because I found out some time ago that I'm not infallible.
* Thanks to Flickr members Boy de Haas and Ondiraiduveau, who both provided some of today's scans.