greenhouse winter protection using polycarbonate

[Amanda W]

Has anyone tried using twinwall polycarbonate sheeting to create a secondary glaze in a greenhouse?
If so, how exactly is breathable tape and aluminium foil tape used?
This is taken from ebay:
"The essential clarity of Multi-wall Polycarbonate Sheeting can only be retained if care is taken to exclude all dust particles insects and moisture. Contamination by dust and moisture will soon lead to the growth of unsightly algae and moulds. The best protection is the use of a quality breather tape and foil tape, which allows full ventilation of all sections and channels of the Polycarbonate Sheeting."

[Cactus Jack]

The aluminum tape go's on one end to seal it the breathable tape go's the other end. The tech blurb is really if your doing a conservatory roof etc .