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As you say Richard, it's a bit ancient, but IIRC, it already had a 2 year history of comments that were few and far apart. Apologies if I'm mistaken. I felt that a casual reader would have found the replies contradictory and confusing, when in fact they were pretty much all valid comments...

I'm a little surprised that nobody's explained all the relevant points in one post. 1) If it mists up, it's no longer sealed. Therefore any demisting will only be temporary. 2) The cheapest 'solution' is to introduce breather holes, which will clear the misting, but reduce the thermal...