Framing jigsaw

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My heads too sore can’t work this out

DC wants to frame a jigsaw which measures 48x68cm

Found a frame which is 50x70cm but it’ll need to be a tight fit or the jigsaw won’t stay made up?

Mount the jigsaw onto backing paper/card first.

It’s a bit of a pain turning it over, but then spray with glue and stick the paper to the back. It holds in one piece then.

I’ve framed a couple and have used sticky plastic sheets from Amazon. You just stick them to the back.
www.amazon.co.uk/Saver-Peel-Stick-Adhesive-Self-Adhesive-Puzzles-Preserver/dp/B09Q37N7Y2/ref=sr_1_11?crid=2ZUTW9KLNFM9C&keywords=jigsaw%2Bbacking%2Bsheets&qid=1674044985&sprefix=Jigsaw%2Bback%2Caps%2C129&sr=8-11&th=1

@BillyMack @MadisonAvenue thanks both

What about the frame size?