[RollinWOT]

I've got an '06 Altima sedan and I'm in the process of making a chloroplast air dam for the front bumper. I want to rivet it on, but my main thing is security. I need it to stay on during freeway speeds and my concern is, will the rivets be secure enough to hold the plastic air dam to the plastic bumper? or should i use a sheetmetal backing to secure the rivets? Any help is greatly appreciated. This is my first ecomodding project and I want it to be good looking and done right. Thanks!