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Scotch 77 adhesive


Nessalco

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Lately I've taken to using Scotch 77, a high strength spray adhesive, for a number of pyro tasks. I find it works very well for quite a few things.

 

It is very handy for making match pipe. Lay out overlapping pieces of 30# kraft, like in the picture below. Spray with 77, let dry until tacky, the roll away. The adhesive grips instantly and the pipe can be used immediately. If you spray one side of a 2" strip of paper, then cut it into pieces, it makes a very useful tape for joining the sections of match pipe.

 

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I make mostly cylinder shells, and there are two tasks where it excels. First is covering the passfire from the spolette to the lift charge. I use two pieces of perchlorate match laid down the side of the shell, and cover it with a 1.5" wide strip of paper prepared with 77. Works perfectly, and is a very compact, low profile solution for shells that may be a bit tight in the gun.

 

I also use it for attaching the lift wrap to the bottom of the shell. Since I often prepare 15-20 shells at a time, It is very convenient to lay out overlapping strips like I do for match, spray them, then apply the wraps as fast as I can roll them on. They can then be filled immediately - no wait time.

 

There are probably other tasks where 77 would serve better than other glues, but these are what I've uncovered so far.

 

Kevin

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It would seem that you can arrange everything to only be glued on an edge except for the top most layer. Do you just sacrifice this top most layer of paper when spraying a batch, or have you bothered making a guide or something?

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I just use a piece of scrap paper to mask off the last piece. It can be reused as necessary.

 

Kevin

post-10587-0-92008700-1436979376_thumb.jpg

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