What isn't made of plastic nowadays? It's EVERYWHERE... and you're bound to break it.
I have a cubby pocket in my car and for whatever reason the genius's designed it with a hole about the size of a quarter in the bottom of it, which makes it useless to store anything but large items; small items would fall through the hole and get lost behind the dash panel. About 3 years ago I got some of this stuff and filled in the hole; after sanding and hitting it with a little paint, it looks brand new. Three years later it's still perfect.
If you need to repair or form a rigid part, then this stuff is great. This is also great if you have a large-ish gap missing in a plastic piece; this can be formed like play-dough into whatever shape you need and it will BOND to the existing plastic and harden. Very strong and durable and can be sanded and painted. I'm working on a mod where I need to re-form a rigid plastic part and will be using this.
I can't say I've used this stuff extensively, though. For semi-rigid or flexible repairs... I don't know how it'll do, but if the part can't be replaced, Plast Aid is cheap enough to be worth a shot. For splits or cracks in plastic, another product like Plastex might work better.
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