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Sorry for the late reply.
This is often used on timber frames with a rebate cut to take a seal barb.
https://www.screwfix.com/p/schlegel-aq21-window-door-seal-white-15m/2822PThe arrow headed rubber seals need to press into a C shaped slot, so the barbs can open out and hold it in
Stick on works to a degree bit it's a bit shit overall.
user69121
Howard
We have some wooden framed windows at the back of our gaff.
They are very draughty. There is no gasket on them.
It looks like there was a space for a gasket to be fitted? If that's what this channel is for, what product should I be looking for?