OK I am home now the magazine was the Feb/Mar 1991 Mopar Muscle, (25th Anniversary of the Charger) the article is "A New Wrinkle" on page 64. The article is a reprint ans was published once before

They bead blasted it

Painted the inside with Plasti kote T3 Hot Rod Black to provide the right degree of gloss

Applied a single heavy coat to the top

Allowed ample time for the T3 to dry then applied the Tempo 817 black wrinkle enamel outside, one heavy even coat. Look at your watch...Wait exactly 10 minutes

Apply a second heavy coat Wait exactly 10 minutes

Apply a third heavy coat you won't see any wrinkling yet.

Apply the Heat carefully and evenly and the wrinkles will eventually appear