Gluing turns a thousand loose pieces into one sheet you can pick up. It is straightforward, and almost all of the ways it goes wrong come from using too much glue at once.
Front, back, or both?
- Front only is the usual choice. It seals the image, adds a light sheen, and holds firmly.
- Back only keeps the surface completely matte, which suits a puzzle you are framing behind
glazing. It is weaker, so it needs a mounting board.
- Both is for puzzles that will be handled a lot. Do the front first and let it cure fully.
What to use
Purpose-made puzzle glue is a PVA thinned to spread easily. Ordinary white PVA works if you thin it about four parts glue to one part water. Avoid anything solvent-based — it will lift the ink.
The method
- Slide the puzzle onto its final surface first. Once glued it cannot be repositioned. Use a
sheet of greaseproof paper underneath so it does not bond to the table.
- Press every seam flat. Run a flat hand across the whole surface. Any raised piece will stay
raised forever.
- Pour a small pool in the centre and spread it with the applicator or an old bank card. Thin,
even, and always in the same direction.
- Stop when it looks wet, not white. A thick coat dries cloudy and cockles the board.
- Leave it two hours, then apply a second thin coat if you want a harder finish.
- Dry flat for 24 hours, weighted at the corners.
Common failures
It dried cloudy. Too thick. A very light additional coat sometimes evens it out; often it does not. Thin coats are the only real fix.
The edges curled up. The paper absorbed moisture faster than the board. Weight the corners while drying — books on greaseproof paper work.
Pieces separated when lifted. The glue did not penetrate the seams. Glue the back as well.
Before you glue
Gluing is irreversible: you are deciding this puzzle will never be done again. That is an easy call for a landscape and a harder one for a photograph of people you love. If it is the second kind, be aware that a puzzle made from your own photo can simply be reprinted — the image stays on file, so gluing one copy does not mean losing the puzzle.
Read next
- Where to Donate Jigsaw Puzzles (And When Not To)Charity shops, libraries, care homes, and freecycle: where finished or unused puzzles actually get used — plus the missing-piece rule that keeps donations useful.
- How to Store Jigsaw Puzzles (In Progress and Finished)Bags, boards, roll-up mats, and shelves: a practical system for unfinished tables and finished collections — including when digital play is the smarter storage.
- How to Preserve a Jigsaw Puzzle So It Lasts on the WallPreserve means more than glue: drying, sealing, UV, and framing choices that keep a finished jigsaw flat and fade-resistant — especially photo puzzles worth keeping.