as far as POR-15 i would not use it. i would degrease/clean/sand/prep substrate and apply couple coats of epoxy primer then after that has cured apply your undercoating. I have used Lizard Skin sound deadening and heat control on the inside of the floor. Dyno mat in my opinion is messy and if you ever have to remove it to do upgrades (mini-tub/weld-in sub-frame connectors) it is a nightmare to remove. I have used raptor for undercoating and it works very well and looks uniform. You could use the Lizard Skin as undercoating as well to serve dual purposes as it dries rock hard.
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