I am looking at getting some Soundown foam to insulate my engine room. I am a bit confused by the difference between these two products:
Soundown Composite Insulation Vinyl Foam Sheets
Soundown Acoustic Absorption Foam
The second is much cheaper than the first, even at the same thickness. What are you getting with the vinyl foam sheets that the acoustic absorption foam doesn't have? The only thing I can figure out is the "barrier" feature, but that appears to be nothing but odor control, is that correct? Would I be extremely unhappy if I got the cheaper foam?