I have now tried T-flex from T-emballage and must say that it's an absolutely fantastic tape to work with. Soft, sticks incredibly well to the vapor barrier and other materials. The problem is that it's insanely expensive. I paid 265 SEK for a roll of 25 meters.
Therefore, I am now on a price hunt to lower the price and wonder if anyone has tips on where to buy. Maybe someone with a firm who has a good price and wants to act as a supplier to us private customers?
I also wonder if it is possible to buy it directly from the manufacturer who seems to be located in Germany? The following is written on the inside of the roll:
D-TACK
Klebeband GmbH
D-73457 Essingen
www.d-tack.de