Gripperrods Underlay Jointing Vapour Tape x 2 Rolls

It's a good quality tape, nice and thin and sticks well to the underlay. Not cheap, but one roll did about 8sqm based on 1m x 0.5m underlay panels.

Did the job that I wanted it for

Bought this after seeing it cheaper than elsewhere. Was great for our underlay

Easy to use and does the job it’s supposed to.