We needed some for a 5SW (Triumph) and after some head scratching and interwebnet searches, we found shelf-feet of the stuff in aerosol cans at the local motor factors.

Having done what it said on the can, which IIRC, was two thin coats followed by a really heavy one, it dried to a perfect crackle finish.

Problem being that you may not have the stuff down there and it seemed to be in original Ford colours, that is, black, black, black and black.

However, Plasti-kote do a brown. . . . . . . . . .

R.