Here are some tips ran upgrade weapon refines. Not just factor lucky, you must have item to upgrade weapon. You will able to hear a chime and from the chatbox there should be a message in a yellow green font 'upgrading succesful'.Ways to succesfully upgrade weapon items :
1. burr - improves weapon power to a maximum of +4
2. fine burr - improves weapon power to a maximum of +9
You will be need lux protection potion for armors and fine burr for weapon
thx kero egames