Max sticks to 1500 pieces. With nothing 2,000. With none 2000. But it is user-friendly and the glue flows easily from the tube.

Edit: I bought it again. Ok, it's for a max of 1500 pieces. MAX. But from the front, you can't see it at all when you put it on. As a result, it doesn't leave any texture. But I have glued a total of 3 puzzles. And with the following trick, I put the UHO decoupage from behind. Only that way it stuck.
I bought one tube for 5 euros and the other for 3.5. It's definitely not worth 5. It's judged at 3 if you want it to not affect the image at all.

Brands of puzzles I glued: Ravensburger, Clementoni, Piatnik, Eurographics, Bluebird, Grafika.

Edit 2: I have bought 5 tubes and have used other glues since then. The glue doesn't stick well. And it's not to pass it from behind, it doesn't work that way. It works by getting in between the pieces and it can't do that from behind in many puzzles. In "loose" puzzles, it's difficult to stick without using the entire tube and it definitely needs a better glue from behind. The best one for this job is UHU.