This is an example of what can be done. Toykilla (Josh) on 350z-tech.com molded his Veilside lip into his stock bumper using Duramix adhesive and Evercoad Poly-Flex (Flexible Polyster Glazing Putty).
Molding
Primered
Painted
Toykilla (Josh) molded his Veilside lip into his sock bumper. These photos are from Josh's 'molding thread' on 350Z-tech.com
Primer .. or .. basecoat. Not sure which .. but hardly matters. Here is where he checked for any imperfections before spraying final basecoat and clearcoat.
Finishd, painted and buffed. Looks good.
Toykilla re-painted his car a Titanium/Gunmetal with satin/suede finish.