fixing polyurethane (vrg bumper)

[fatal1]

hey i just got the vrg bumper it is made of polyurethane, my plan i to cut out the lower grill fins and have that open look similar to sleek_gtz but i will be keeping the license plate bracket. anyway after i cut out the fins how would i go about smoothing it out and giving it that "finished look" i tried searching and didnt come up with anything but i remember that it is harder to do then fiberglass and fiberglass and bondo will not hold well any tips are welcome

thanks alot

[pinoyesv6]

this site (http://www.urethanesupply.com/bumperidstart.html) might help.

fusor and duramix also make products that you might be able to use.

[fatal1]

thanks a lot i will definately check into it