I've got two older motorcycles, one 1992 and the other 1997. They've both got specifically shaped airboxes, and both connect to the carbs through four rubber boots, similar to those that go between the carbs and the cylinder head (I assume older cars have the same setup but I never took apart my cars as a kid so am unsure) but the difference with these boots is they come attached to the box. The box itself is made of hard plastic, but the boots are rubber. They're fixed to the box out of the factory by some sort of rubbery glue, and on both bikes it's decayed and come away. One bike is not yet running, but for the other I simply sealed the joint with some silicone tape.
Any idea of what this glue stuff is called, and should I be looking for more of that to fix things, or finding another alternative rather than relying on silicone tape?