I'll take/upload pics around 12am central, tonight... I weighed the cans before and after I sprayed, lost only about 1.5 1.7 lbs...I guess not as much as dynamat...I'm gonna put dynamat over it, under floor mat areas front and rear, just for a little extra sound insulation...I think the rust was just from wet feet/mildewed carpet, the location of the rust was consistent with where you would put your feet.