RUST IN SHIPPING
Many N.G. occurrences sending spark plugs to Thailand. Desiccant not enough. Anti rust oil could not prevent white rust on the ring coated with zinc. When oiling , oil tends to melt down.
VCI Branorost U7 type Stars
Persada Silver created punching tools that have stars shape and make the VCI paper that has that stars punches. User just stab the paper to the spark plugs.The N.G are over.