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Putty should not be allowed to dry completely. If it does, then it will become brittle and may shrink and crack. The main purpose of putty is to form a seal between the glass and the wooden window frame. The putty should be painted to seal in the linseed oil which keeps it pliable. A film of hard putty on the surface forms after 2 to 3 weeks (weather dependent) and then the painting should be carried out to stop any further drying of the putty.

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Q: How long to leave putty to dry before painting?
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