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I love jigsaws over the winter months and I probably do at least one a week, with an hour here and a couple of hours there, but in summer I never give them a thought.
You can get special glues to mount them and pastes to cover the fronts so they stay together keeping their colour for ages. Not had one fade in the 10 years we've been doing them with the mod podge paste.
Excellent. Thanks. Was thinking that a 2 part resin spread over the face might do the trick, but will investigate once I'm close to completion, which may be some time!!!