Wurth is a brand, OEM manufacturer sila of a lot of stuff, kinda like 3M and Bosch.

Sa Hahn Tools shang sells Wurth stuff, although di ko sure kung meron yung cavity wax. Sure ako meron ang Wurth dahil yung ahente pumunta sa shop dati, kaya lang parang ayaw nila magpaorder hehe, di lagi dumadating tapos kami pa pinapabayad sa shipping.

You have to remove the existing rust first, kung surface rust lang light sanding + turko or equivalent will suffice.

http://www.wurth.com.au/cataloguevie...f=A03_0039.pdf