This glue is amazing. It is incredibly transparent and once dry becomes fully transparent with a pleasing glossy sheen. I've seen a number of complaints from other reviewers which I'd like to address as I think they're quite unfair: 1. Complaints that this glue is dirty. If you take the right precautions (see below) this glue is definitely NOT messy and applies very easily and cleanly. All you have to do is pour the glue into the center and then spread it out with the spatula/scraper provided which can then be thrown away. No need to buy a brush or other tool, nothing gets on your fingers, no problem. I don't understand how you can call this dirty. The glue itself is quite thick so it doesn't run and go where it shouldn't. I think people are inattentive and kind of smear the glue over the edges of the puzzle. This is not the manufacturer's fault. The glue is so thick that it is very easy to control. I glued a few puzzles together and none of them went overboard. Complaining about the glue seeping between the puzzle pieces - why is that a surprise? Did you think your puzzle pieces were waterproof/hermetic? The glue is obviously liquid (although it's quite thick and viscous), so how can you blame the glue manufacturer for the gaps between the pieces of your puzzle? However, I've never had a problem with glue seeping through (partly because I buy high quality German jigsaw puzzles with tight-fitting pieces, and partly because I put wax paper under the jigsaw puzzle before gluing). Complaints about the glue sticking your puzzle to the table/paper/cardboard underneath. This ties in with the above when the glue either oozes out or people put the glue outside of the puzzle so the glue drops are too small. And yes, if you do this the glue will stick to it unless you put a non-stick surface (like wax paper) underneath. Again, why is this a surprise? In all honesty, anyone who has ever bonded knows to be careful with the surface you are working on. I glue 2 strips of wax paper together, carefully slide the wax paper under the puzzle and then apply glue. Never had a problem.4. Complaints that the glue causes the puzzle to twist or become wavy. Again, it's not the glue's fault. It is inherent in the bonding process. To be honest this glue doesn't pose as much of a problem as I expected if you take the right precautions. Wrinkling occurs when the adhesive is unevenly distributed. There is some shrinkage as the glue dries, and as different pieces or sections of the puzzle shrink by different amounts on a very, very small scale, then there is some twisting. Therefore, the most important thing is to spread the glue evenly. Also, you should not apply it too thickly, as this can also lead to uneven drying. If you still get frizzy despite being careful, it's easy to fix. First allow the glue to dry for a few days until the surface is no longer sticky or tacky. Second, turn the puzzle over and place it face down on some sheets of wax paper. Third, put heavy books or other flat objects on the back of the puzzle and wait a few days. After that, the puzzle should flatten out. Complaints about the adhesive not covering as well as it should. It's actually a valid complaint. Each bottle says it contains enough glue for puzzles from 2 to 1000 pieces. Ultimately, it's not about the number of pieces, it's about the size or area of the puzzle you need to cover. Without specifying the area covered by the adhesive, the quantity of 1000 pieces does not make sense. In practice I have found that I need BOTH bottles to cover ONLY ONE SIDE of a 27" x 20" Ravensburger 1000 piece puzzle. This is 540 square inches for both bottles, or 270 square inches for each bottle. A few tips: A. Glue two strips of wax paper together, then carefully slide them under the puzzle in a back-and-forth sawing motion. I find it easier to pour glue into two "pools" (one in the middle of each half of the puzzle) than into a puddle in the middle and then smudge from there. Since the glue is quite thick, it will take some time for everything to flow out of the bottle. I like to hold the bottle over the edges of the puzzle and let it run down the outer edge of the puzzle. This makes it easier to ensure that there is enough glue around the edges. D. Refers to (C). Make sure there is enough glue around the edges! Seriously, it's easy to think the edges are covered, but when it dries you realize you didn't make it to the edge and now some bits are loose. After applying the glue, look at the puzzle from different angles or look around with a flashlight to make sure you've covered the entire puzzle with glue. This material is so clear that it is difficult to tell where it has been used and where not. I use different lighting angles to try to see the difference in shine. Where the puzzle is a little dull, I know I need to put some glue there. F. Hmm. Do not apply glue beyond the edges of the puzzle. Allow the glue to dry for a few days before touching or moving it. Once dry, turn the puzzle over and glue the back. I only paint with a thin coat of Modge Podge because I have it on hand and it's pretty cheap. You don't need to buy more of that puzzle glue for the back. No one will see the back and, frankly, that would be overkill. And one more thing: the shiny Modge Podge is absolutely nothing compared to this material. This puzzle glue is 100x better and makes the shiny Modge Podge look matte and blurry in comparison! Hope this helps Adam.
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