I have a 19 by 16 inch puzzle I'd like to preserve. I'm not good with painting, gluing, crafty things, I would like any recommendations for what's good and easy to use.

 

Hobby Lobby or any other craft store will have puzzle glue or Mod Podge that you just brush on, just follow the directions.

 

When I want to keep a puzzle or mount it on a wall like a picture I do this:

Use a thin board or cookie sheet to flip it over.
Spray glue on the back.
Apply some heavy paper or thin cardboard as backing.
Mount in a frame or on a wall with mirror clips.
A sheet of plexiglas can be mounted in front with the mirror clips for more protection.

I also have some wooden puzzles that have interesting piece shapes. In order to be able to see the front and back, I sandwich the puzzle between two pieces of plexiglass held together with cap nuts and bolts and spacers that are the same thickness as the puzzle.

And here is one under glass as a countertop:

 

I do similar to 2John and sandwich the puzzle in a picture frame. I've never liked the appearance of a heavily podged puzzle. Most of the time we don't bother with any adhesive and just sandwich the puzzle in the picture frame. Then in a few years when we want new "artwork" we replace the puzzle.

 

Good suggestions, thanks to all.

 

Joan Steiner "Hidden Objects" puzzle mounted with mirror clips and plexiglass.