Spray in sound deadener/undercoating??

[bagged91]

When I finish doing the rot repair on the 72' Burb, I wanted to spray undercoating on the inside of the rear wheeltubs, underside of floorpans and rockers and also inside the truck on the 1/4 panels. Mainly I wanted to do this to try and prevent or at least slow down the rust from happening again but I also want to loose some of the tinny work van sound on the inside. My main concern is odor. Has anyone used undercoating on the inside of their truck and experienced any foul odors on a hot summer day from it? Anyone have a product they used that they could reccommend? Does the spray in Rhino Lining stuff do anything?

Thanks! Joe