lol, you mix two different things up. One:
90% is the max repair effectivity in the game, yes, I can do it 
For example, your arts with 0/50 durability, after my repairing, it becomes 45/49.
The repair fee you need to pay as clanmate is 110% of repair cost.
How to do it?
1. find the repair fee here
http://spreadsheets.google.com/pub?key=rUJEzVg5XzX_Z02E2JRuVyA&gid=0
2. transfer it to me, note "repair fee for ?"
3. transfer your art with recall in: 0.01 days, 0 combats and "Allow repairing", 1 gold only.
Two:
3*9% is weapon enchanting, which is GGW doing.
Weapon enchanting don't change the durability of art, but make your weapon better, and gives you addtional damage.
a little more detail about enchanting:
http://dragonheroes.ucoz.com/forum/6-12-1
Can some1 help me? 
