The sealant was just skinning over on my mum's newly installed double glazed uPVC windows, doors etc many years ago (and all the houses on here road basically have a timber/uPVC front and back due to the design, so its pretty obvious) when as a lad, I answered the new door to a knock . . .I get flyers through the door from stairlift companies, and I'm in a bungalow, so don't be too disheartened.
Bloke selling double glazing . . .