NO MORE SEWING
Beacon Fabri-Tak does an excellent job of bonding fabrics, without soaking through. For guys, its a Godsend---no more stapling torn pants pockets or hemming pant-legs with duck-tape. I've used Fabri-Tak to hem pants, to apply patches to holes in work-clothes, to apply uniform patches, even to make up straps and belts with webbing and plastic buckles. For repair patches, it works better than iron-on patches. The only real major limit is seams which come under alot of stress, such as pants inseams (i.e., crotches) (including zippers), or children's play clothes.

TACKING
Another use is to make difficult sewing jobs easier. For example, you can "tack" material together for a rough fitting, adjust to a tighter fit, and then sew the seams. Or you can assemble a garment with Fabri-Tac, and then sew it easier (i.e., with simple stitches rather than multiple rows or complicated stitches).

FOR COSTUMES
Although no other reviewers mention it, Fabri-Tac is ideal for assembling costumes which will only be worn a few hours and probably never be washed.

FOR UNIFORM OR DECORATIVE PATCHES
1) Mark the target area. I suggest using a soft pencil (or water soluble felt-tip marker) to mark underneath the edges of the patches (where the marks won't show) For round patches, mark the orientation, i.e., the exact top and/or exact bottom. Do NOT wash the garment immediately after applying patches.
2) Apply a light bead of glue 3/16 to 1/4" from the edge around the circumference, and then thin parallel lines about 3/8" apart across the interior which corresponding to embroidered parts of the patch. Some patches are virtually completely filled with embroidery, some aren't---do NOT apply Fabri-Tak to large (> 3/8" in diameter)unbroidered areas, or the patch may "pucker".
3) Align and press hard enough to spread out the glue. Place a heavy object (such as a brick or several thick books) on top of the patch (and underneath if you need to make a flat surface), and leave it for an hour. If you do this alot, then squares of thin plywood the size of the patches (on the top and bottom) and spring clamps will do the trick and allow you to apply several patches at a time.
WARNING--patches applied this way may be impossible to remove after a week---if the patches are temporary, don't be so diligent, a light bead around the circumference is enough, or better yet, sew temporary patches on.

TIP ON USE
It REALLY dries fast. Maybe after a minute you can still tack things together temporarily, but you won't have a permanent bond. If you want a permanent bond, apply to a small section and quickly press the fabric pieces together, and hold for at least 5 seconds, before moving on to the next section. If you can, clamp the section behind you as you go--clothespins will usually do, but spring clamps with flat pivitong jaws are better--Denali 14-Piece Spring Clamp Assortment. Press the fabric pretty hard--that gets the glue into the fibers. When you are done, go back and press the fabric together again.

GENERAL PRINCIPALS OF GLUING ANYTHING WITH ANY GLUE
1) The strength of the bond is proportional to the area. That means, spread the glue uniformly over the whole surface.
2) Although counter-intuitive, the THINNER the layer of glue the stronger the bond. Especially with other types of glues, it often helps to use a spatula (such as an old plastic credit card) or popsicle stick to spread a then uniform layer of glue. With Fabri-Tac and some other glues/situations, you can apply a thin bead, and then squeeze it out into a thin uniform layer by pressing or clamping the peices together. Light clamping, or using weights for the same purpose, until the glue sets improves any gluing job.
3) Regardless of the instructions, all glues take days, even weeks, to reach full strength. So, it is best to set aside garments repaired with Fabri-Tac in a warm ventilated place for a couple of days before use---and NEVER wash garments immediately after repairing them.

THIN ON THIN
Applying thin fabric (such as ribbon, or a large area of thin felt), especially on thin fabric is a challenge. Mark the target (see above). Cut the ribbon to its final length. Then work fast. Apply the glue to the full length of the ribbon. Apply the ribbon to the target. Place a thick piece of paper over the ribbon and burnish. That means to rub hard. It is best to burnish in two or more stages, 1) quickly to get the whole ribbon burnished down, 2) repeat slower, and 3) repeat even slower. A small pastry roller is good for the first stage--but you can use your fingers or a spatula (don't forget the paper). For the last stage, an old thick credit card works well---push hard with the edge, bending the card, but keep it moving, in multiple short strokes(don't forget the paper). For items which will not be washed glue sticks will probably work better Avery Glue Stic, 0.26 oz, Pack of 6, (98095). For the most difficult projects, use spray glue.

PREVENTING LEAKING AND THICKENING
My experience is that the bottle inevitably falls over on its side, and leaks. Tightening the cap doesn't seem to help. The same problem causes the glue to thicken over time. The simple solution to this to store the bottle in a tall glass bottle. A 6 1/2" tall olive jar is perfect.
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I have been a "crafter"-"sewer" for over 60 years and this is my favorite item in my sewing basket!!! It dries flexible, clear and launders well. It tack fabric together instantly but will pull apart, to readjust, if needed. MAC

I wasn't expecting this stuff to be very effective. I have a pair of jeans I really like that were patched/reinforced (on the inside) with iron-on stuff. After several washings, the patches were coming loose, but the fabri-tac really glued them back down tight. The jeans have been through the wash a couple of times now and the patches are holding-up well. I also have a big cushion for an teak outdoor loveseat. The stitching was rotting and the whole thing was coming apart. It took several days of gluing different sections, but I was able to put it all back together again. The new seams are a bit stiff, but they're very strong. I used very little of the product for these two jobs. I'm impressed.

This fabric glue is the best I've ever found. I've tried a couple of others and haven't been pleased with the results because they don't stand up to washing and start peeling off far too soon. The fabri-tac does actually seem to be permanent or as permanent as a fabric glue is going to get. I even used it to install zippers on the pockets of several jumper dresses and they are all still holding up after multiple times through the wash. The only thing negative is that it can come out of the bottle in globs and it dries extremely fast so it's very important to be quite speedy and precise when using it so I probably wouldn't recommend it for childrens crafts or similar uses.

Update: I love this fabric glue even more after discovering that it works great for repairing popped air mattresses.

I love this glue. I use it for crafting items, and this is a dream. It requires very little for most tasks to hold extremely well. Also if this glue spills it tends to turn into a solid rubber glob, that can just be rolled off fingers. What has sold me on this product is that it doesn't seep through things like felt when sticking areas together, and then not ruining the outside look of the item I'm making/building. One draw back, I find (but only when the bottle is nearly finished) is that the thick consistency can be hard to squeeze from the bottle, giving you a little cramping in your hand. I recently ran out of this and my local store doesn't carry this brand anymore, so I bought Arlenes Tacky Glue (pen style) and 'Arlenes clear gel tacky glue'. Neither stuck well at all, and both soaked right through the felt to stain the outside of the felt. Go with this product.

Best glue for cloth out there I think. I've tried several and none are as good as this. I used it to save all my old socks that are perect except for the hole in the heel where they all fail. I take a matching sock and cut out enough fabric to cover this, then glue it on instead of darning that I HATE to do.
It saved me $50.00 worth of great socks and it washes well too. I love this stuff and you get plenty of it as well.

After reading the other reviews, I was expecting a kind of "super glue" that worked on fabric. This adhesive may work fine if you are already planning to sew the fabric after using the adhesive. I was hoping for an adhesive that would hold patches on clothing without sewing. This adhesive did not work that way. Any fabrics that I glued together pulled back apart relatively easily. I'm sure it's a good adhesive to hold fabric while you are sewing it, but it didn't work for my purposes.