I used 10mm bolts/nuts + lock washers in a zig-zag pattern around the inner and outer edges so it can pull the fascia down flush to the lip and not look like the lip "floating" under the fascia. I'm sure there are other methods that work just as well.
1993 Nissan 300ZX Slicktop (Oxford Gray Metallic) 1991 Nissan 300ZX Slicktop Track-Star 1992 Nissan Skyline GT-R (Gunmetal Gray) - Long Live the Z and Godzirra! - "Love cars. Love people. Love life." - Mr. K.