According to Jay Leno . . .
Spray-On Chrome - Jay Leno?s Garage | Tune.pk
Bear in mind, that the parent metal is being covered by a "coating of paint" and depending upon as to how thick they (2) they are,
will depend upon how "perfect" the cleaning/pre-buffing has been. Better to have a smooth, uniform surface so that there are no
"dimples" or other untowards with the finished product.
Regards,
J T