i'm going to start installing some sound deadener. i looked through some current projects that guys are doing and most of you cover everything and then cut the holes for bolts after such as seats, door panels, body plugs ect. does this cause any problems with things not fitting right? i'm worried that things like door panels won't ''snap'' on the way they should due to the extra material. i'm also concerned that some things might tend to loosen off after time after this stuff compresses. am i way off here?