Ebb,

I very much appreciate your input on this. You know, now that I think about it, it takes a lot longer for any mold to appear on the liner, as you state. So the air, balsa, or whatever the Portuguese builders did with 376 does provide some insulation to reduce instances of reaching the dew point compared with the sides of the hull. I won't fool with it! You've given me ideas on attachment and surface coverings. Most importantly, you've confirmed for me that I'm not crazy to be thinking about using elastomeric foam sheets, PVC or other compound ( my visit to Armacell distributor may help me there) versus other alternatives.