what is the hard black mastic sealant used on drivers?

On drivers I often see a black sealant used to secure and protect bare wires and terminals, adhere metal screening or other small parts to metal or plastic.
It is quite hard and strong, but appears to be brushed on.
What is it and where can I get some?
Thanks.
 
I suspect we are not dealing with anything intended for roofing short of the bitumen polyurethane resin flashing or perhaps the liquid part of the PMMA systems. An asphalt based product like plastic cement is not what you are looking for and I suspect neither are the acrylic nor silicone products as those are intended to remain pliable.
 
If used to fix random light parts, you might very well use some hot glue.

Black or transparent is not the point here.

Personally and to protect against vibration or jumping around in transport I squirt some thick contact cement, basically because I always have tons around, for cabinet tolexing or speaker assembly.
 
On drivers I often see a black sealant used to secure and protect bare wires and terminals, adhere metal screening or other small parts to metal or plastic.
It is quite hard and strong, but appears to be brushed on.
What is it and where can I get some?
Thanks.
I have used this black glue dozens of times, its one I prefer. https://www.simplyspeakers.com/speaker-repair-adhesive-mi-3035.html they have a clear and the black stuff https://www.simplyspeakers.com/speaker-repair-adhesive-mi-2000-8oz.html

for surrounds , cones, holding electrical poles, dust caps, to keep wire from flapping against the speaker cone. its great stuff, unlike many many repair glue substitudes, to white lepages., wrong wrong all wrong, junk for speaker repairs.

The beautiful black adhesive dries tough, yet remains a tiny bit pliable to allow minimal flex and movement for high performing cone/surrounds. Once it sets it looks like the vary glue they use at the speaker factories, that seemed like one of the great speaker mystery's to me. I searched high and low trying to find "that black stuff", or a glue that very closely replicates it. Low and behold there is such a place that carries that stuff!!... its called simply speakers - repair kits.
 
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