Here the Plastik spray smells like the bonding agent used for PVC pipes, which is acrylic or PVC in a solvent.
I mold plastics, so I can discern between most plastics just by the smell.
The commonly used material for solvent bonding acrylic is chloroform, again a familiar smell, which may also be mixed with aromatics like toluene.
Like mentioned above, this is not a regular factory process, but a special modification for harsh conditions like marine.
Come to think of it, not much seen in car audio either, which is a harsher environment than inside a home.