Undercoating vs. Bedliner

Like others, my carpet was molding and smelling really bad. I pulled the carpet out and to my surprise found very little surface rust. I won't be putting carpet back in. I know several people
that have used bedliner products to coat the floor. Could I use rubberized undercoating? I like the advantages of the rubberized undercoating but not sure if there are cons to it. Thoughts?
Thanks, Cheapjeep2

I just answered this on the OEM forum. Please do not post the same question on multiple forums. It's quite rude.