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G'Day Chris,
The sheet metal is always going to supercool under a clear night sky, which will nearly always cause condensation underneath. You need a vapour barrier - something to stop moist air reaching the sheetmetal to condense. In a house, sisalation (that silver foil under the roof) does this job, sometimes with insulation as well.
If you can use sisalation make sure it's sealed all the way around with aluminium tape.
If sisalation doesn't suit, you could try gluing say 3mm insertion rubber sheet to the inside of the shutter with contact adhesive. This will act as the vapour barrier and insulation combined.
Sorry can't advise on any spray on stuff...
Al.
Last edited by sheeny; 21-06-2009 at 09:12 AM.
Reason: typos
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