Don’t put up with draughty UPVC windows. This tape is excellent

Easy to install even from the inside once you get your head around it. Tricky on the Sash where the hinges are but only on the LHS for right handed installers. I have a doggy LH thumb which was not helpful. Good product. To check if this is the tape you need pull out some of the original tape and check Q-Lon is embossed on