What was installed prior to wheel well sound Deadener? 71-2 Demon

I find that the bumpers were installed prior to undercoat. Front bumper brackets usually have overspray on the rear area. Pretty much any part in the general area of the wheel wells would be installed prior to undercoating. The rear axle rebound bumpers were undercoated, so were the front fender side markers.
It would make sense that they couldn't risk having parts not fit if the undercoat guy got carried away, and blasted a heavy coat of the black stuff where he should shoudn't have.