Normal vehicle IRR paints are harmful to canvas & no canvas tolerant version (ie emulsion) was available at the time of their introduction in 1980. At that time canvas had to be reproofed with Mystox W6070/29 which was a special preservative/flame proofing emulsion in Olive Drab (not NATO Green). Later "Paint, finishing, IRR, emulsion matt, NATO green, air drying" was introduced.
Even so there is no black IRR canvas paint. The canvas has to be first washed with soap or if greasy with degreasing compounds or detergents, but not solvents. Once dry the canvas has to be treated with "Solution Re-proofing & Water-proofing H1/8030-99-220-2681" The entire canvas is then painted in the IRR NATO Green then the black areas are provided with "Paint, finishing, polyvinyl acetate emulsion, black, air drying".
It would be a good talking point to present a vehicle depicting the early-mid 1980s. The body painted using NATO Green yet the tilt in Olive Drab. I wonder how many observers would be tempted to point out apparent inconsistencies?
Incidentally there is no IRR NATO Green for nylon & terylene covers & tilts, here "Preservative Coating, Olive Drab Emulsion" should be applied.