Hi and sorry for my bad english.
A bug exists to make weapons +++ safe, tested and working on many hopzone servers L2J Gracia!
Here is how do it on Gracia Part II server:
You have weapon, make it +3. Now, click enchant scroll. You put weapon in there. Now click on the box that opens options box, down right corner and press RESTART. A dialog pops up. Do not press it!!! Now, you go and press to enchant your weapon.
BE CAREFUL NOW. Watch the bar moving, EXACTLY the moment it ends moving (or you may need to do it JUST after that), press the YES to the restart dialog. If you do it too early, nothing happens, if you do it too late, your weapon break. Now, if you do it on the right time, if your weapon is enchanted, you will see it at the login screen and in game, if your weapon broke, you won't see it equiped at your hands at login, but, when you login, you will see it IN YOUR INVENTORY!! Full enchants, as it was!
Tested by me and my friends. Have fun, and good luck :D It's all about timing!