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The external seal is likely to be one of these E gaskets
https://jcphardware.co.uk/gaskets-seals/e-gasket/
Internal one could be the same, or another E gasket, or possibly a Wedge gasket.
A sharp stiff scraper, glazing knife. remove the beads from the inside, remove the glass unit and see what's installed.
user69121
The sealing bead around my windows has perished / is peeling off in places and I want to fix it. I assumed it would be something I could buy on a roll and be an easy job but my searching hasn't yielded anything.
Does anyone know what the seal is made from? I thought it was a bead of sealant (put on with a gun) but the corners look like they are cut from a strip.
Both the interior and exterior beads should be white but thanks to the A2 they aren't...