3M 86234 Super 77 Multipurpose Spray Adhesive, 13.44 fl. oz.

The product is expensive but does the job well. The problem is that the seller has listed the item as non-returnable and yet delivers used nozzles. That is not OK since : A. It’s a rubber-based adhesive and a clogged nozzle is almost impossible to use. B. It makes you wonder as to what is going on ? The can seems to be new but the nozzle is old. It’s strange.

Mentioned quantity 13.44 fl (381 g) oz but received 10.75 fl oz (305 g)

Bought to stick the roof cloth of car, did not work at all

I used this adhesive spray to bind acoustic foam to chipboard. It only managed to spray about 60 square feet of adhesive before running out. I ended up running out before I was complete. That's a single layer of product on one substrate only. I also had to test to make sure that the adhesive was "aggressively tacky", and the timeframe for that is 10 seconds to 10 minutes, which a completely useless figure. I contacted 3M directly, and they couldn't even give me an estimate for how long it would take because it apparently varies so wildly due to "substrates, temperature, humidity, and amount of adhesive applied". Also, this is the clear version of the adhesive. I thought I would be able to see some white adhesive down and it would slowly cure to become clear. This isn't the case: it sprays on completely clear, making it very difficult to see where you've sprayed unless you have the proper lighting conditions. After the spray became aggressively tacky, I applied applied the boards together, and although the spray claims to be adjustable, it really wasn't. The pieces wouldn't budge without tearing the foam. I thought I would be able to align a 1' square piece of foam with a 1' square piece of chipboard, but because the adhesive wasn't adjustable like it claimed to be, I ended up having to cut the boards off of the foam, then I had to cut all of my boards to be smaller than the foam pieces and place them on without adjusting. When I was removing the boards from the foam, I realized that only some of the board was adhered to the foam. Some areas had complete foam-tearing strength, and some other areas were so easily separable. In fact, the chipboard was so warped and the adhesive was so weak that some corners were so easily separable that the corners peeled away from the foam without my help. The warping ended up being due to moisture problems unrelated to the adhesive, so I'll give the warping a pass. However, the adhesive couldn't hold the soft foam to the boards at all through the warping. Overall, for $11, it's an decent and affordable adhesive for acoustic foam and chipboard. Just know that it's not adjustable, you won't get much spray, your aggressive tack time is probably going to be some random time between 10 seconds and 10 minutes, and that you can't rely on the adhesive to hold uneven surfaces to soft foam. Edit: After a while, the pieces of acoustic foam that I've hung up have occasionally fallen down. I've had to use some painters tape and newspaper to tape off areas of my wall, spray the spray onto the chipboard that is still adhered to the wall (with 3M's Command Strips), and spray the foam itself in an attempt to develop a more permanent bond. They haven't fallen again, so far. If you want permanent adhesion, especially with foam, spray both the foam and whatever you're attaching it to.

It’s a new look for the can and I’m wondering if the formula was changed as well. I have used Super 77 in the past and had excellent results. However that was not the case with this product. I cleaned both mating parts with acetone and applied a coat of the cement to each part. The tack did not appear that aggressive so I applied a second coat as specified in the instructions. The tack still didn’t seem as aggressive as older cans used in the past but it seemed to stick well when the parts were pressed together. A third part, a trim ring was riveted to the bonded parts and I set the panels aside. Several hours later I noted that the rubber that was bonded to the aluminum had started to lift and puff up. I contacted 3M and they said to try heat to reactivate the glue and use weights on the panels until the glue was fully dry. After several failed attempts it appears the rubber is now stuck down. How well, I don’t know. I did have one area that just would not re-bond. I finally injected ultra thin super glue through the rubber with a syringe and that worked to tack the unbonded area. If the adhesive does not continue to hold down the rubber I will be forced to drill out 104 rivets per panel (there are two panels) remove the rubber, clean everything, apply new adhesive and reassembly and rivet. Probably an additional 50hrs labor plus materials. I will be using Weldwood adhesive if I need to do this as I cannot use the 3M product a second time just to have it fail again.