Our plane (1978 M20J) has the SB-208 done - but the insulation was only replaced around the cabin. Back around the baggage area there is still the old glass fiber insulation both on the walls and ceiling. I'd like to replace this insulation with something that does not absorb water and isn't a pain to deal with. Can someone suggest a good replacement for the standard yellow glassfiber insulation? I'm not even sure insulation is necessary so I would be interested in opinions on that too.