Spraying Wood Bed

[taylorbg]

I have purchased Lizard Skin Heat Shield and Sound Deadener. It sprays in like a bed liner. I have also bought some spray in liner, that I will spray on top of that.

So, Sound Deadener, then Heat Shield, then Bed Liner.

This will all go on the floor of my 72 Suburban. Now, I have been assured by the guy that the stuff will have no problem spraying and sticking to the wood. My question is, if I did that, would it shorten the life of the wood? If it gets wet underneath from rain, maybe it needs to breath from top too so it would not rot? I do not know. Does anyone have any thoughts or suggestions? Ideally I would prefer to spray the wood too, but not if it is going to shorten its life any. The last thing I want to do is replace that floor.