Molding Fiberglass lip to a urethene bumper

So I'm planning on getting a body kit put on pretty soon, I've asked around for prices and so far I got quoted $600 for the following:

Molding front lip (Made of fiberglass) to my urethene front bumper.
Filling in the side markers
Filling in license plate holes
Preping for paint
PAINTING JOB NOT INCLUDED

The reason for the price was that he said it's harder to mold a fiberglass lip to a urethene bumper. He said he would need to use a special material to first mold the lip onto the bumper than it has to sit and dry for 48 hours and then he would fiberglass over that. Is this really the case or is it just bs?

It's not B/S and it's not a good idea. The urethane is flexible and the 'glass is not. Hitting bumps and will flex them enough that they will crack and peel in a short time. If you have him make the glass piece seperate and bolt them together that would be your best option. Hide the bolts in the glass piece and don't mold them together. There will be a visible seam but it will look better then the cracked paint you'll end up with.
Mark