Most hobby stores that carry Testors products will have it. You can also learn more about Dull Cote via the Testors site.
Difficulty Rating
Many first-time customizers visit this site. In an effort to help them select their first projects, each custom has now been assigned a difficulty rating.
Easy: A simple parts swap. Little if any paint.
Basic: Some modified parts. Mostly a new paint job.
Moderate: New and modified parts.
Skilled: Lots of new and modified parts. “Frankensteining” often involved.
Advanced: All of the above, plus a great deal of original sculpting.