When our granddaughter Mikala redecorated her bedroom, she chose three large puzzles to put together, glue and frame to hang on the wall. The favorite of these took a bit longer to put together, a job hindered by two cats who loved claiming the game table for themselves.
Before completing this beautiful scene of faires in a forest, two pieces were lost. The company would normally replace those pieces but the puzzle has been discontinued. So we figured out a fix: Mikala had used Paperclay before; after gluing the puzzle together, she filled the holes with this and let it dry. Then I coated it with Daniel Smith's watercolor ground. While waiting for it to cure, I played around with watercolor and gouache colors to match. I drew the above supplies while waiting for the watercolor ground to cure on some sample pieces of Paperclay. I will practice on these before doing the actual puzzle.
Deciding that gouache works the best, I will paint the two areas to blend in with the scene. After it's dry, they will finish the surface with Modge Podge, then frame and hang.