I'm often driving on gravel roads where I live and the tin can sound of the rocks spitting up and hitting the undercarriage is starting to become annoying. I luckily don't really have any rust and the car is pretty well sealed except for a slight leak somewhere in the passenger footwell (dealing with that).

My thought is to throw some Dynamat or other sound deadener, under the factory padding, to help with this. But, before I start sticking this stuff everywhere, are there any downsides to this? I think the answer is no, but wanted to put this out there before laying down a bunch of product that is supposedly unbearable to remove if it has to be.