From http://forum.square-enix.com/ffxiv/t...l=1#post956357

錬精度が1以上溜まることでバインド化する想定のため、
この条件を満たしていない物であれば、他のキャラクターと受け渡しを行うことはできます。
なお、もともと受け渡しができないアイテム(Ex属性など)の場合は、
バインド化の有無に関わらず受け渡しは出来ません。
The idea is that if you get more than 1 spirit bond point, the item will be bound to your character. Therefore, if it doesn't meet this requirement (Item having 0 spirit bond points) you will be able to trade with other characters.
For items which you can't trade in the first place (such as Ex status items) no matter if the item is bound to your character or not you will not still not be able to trade them.
This is news to me - or I just haven't been paying attention. Spiritbonding aside, I read this as any equipment that you've used ... at all... cannot be sold or traded. I'm not sure what to think about this. On the one hand, no more worrying about having to repair items to 100% in order to trade or sell because -- well you can't! On the other hand, it sort of sucks to not be able to lend gear to people in your Linkshell or other friends or hand me down gear your done with. Many times while leveling my items might not be spiritbound to 100% before I am upgrading to a new piece of equipment. So then what? Just toss it I guess?

Not really liking this change. Great for crafters though.