Anyone here put together jigsaw puzzles?

If you do, have you used this product called, Puzzle Guard?. It's puzzle glue to glue your finished puzzle together. Got it at walmart a few years ago, and on the back of the container it says, "Used Best Before OCT 2020"

I have no problems unscrewing and removing the cap. The cap also doubles as sort of a glue spreader. Well when you take the cap off, the glue runs down the spreader with good consistency. It looks like it did when I bought it. I'm just wondering if this is still good to use, or do I need an entire new bottle of Puzzle Guard?

Thanks.