Lately, I heard of a lot of "returned packages" (to the US, by some customs agents), because it (the product) was suspected not to comply with rule blah-blah... One example: if steel products are not declared as "made in USA" they will most likely not find their way to Europe, because Chinese stuff gets real problems here.
Well, chinese Crap can be sunk on any ocean, if you ask me, but many products are *only* made in China at all - so, what's the alternative?
But mostly, it was only a minor error in declaring it correctly. Now, find a seller in the US who will re-do the whole formular-crap...
And also true - we almost can't get any good paint, cleaner (fill the blank) here in Germany (Europe, I suspect): "just for professional use [-> after providing proper licenses]"
That's just awful.
But it's a "free" world, ehh??