VHT wrinkle paint

I've never done it myself but I've seen people do it.My friend's son did it on his Honda,red over black,it looked good.Have to do real light coats of color and heavy coats of VHT.His son preheated valve cover in an electric oven loaded it with paint then popped it back in oven to cure. I guess it gave it a deeper or more textured wrinkle.I did my air cleaner and M/T valve covers that way and they turned out great.I let them just air dry the first time and it barely wrinkled,I guess you could use a heat gun.