Well i never got any insulation fitted, got the heating working ( oh yes it rocks, baby, in a T shirt not a sleeping bag(driving in a sleeping bag is difficult but you got used to it )) especially with this weekends weather it was awful on the east coast, found some great free overnight sites though. anyway my battle with condensation. still absolutely awful, dripping down the sides. cant get it clear cant see outside, spoiling my view, it was. it only cleared when the weather changed. I did buy some salt but was really unsure how to deploy it, as spilt it once and was unhappy to leave it our so maybe the gimp2000 could elaborate on his successful salt usage....