Napier VP90 offers the greatest level of protection of any rust inhibitor. Simply place a VP90 sachet inside your bag, case or cabinet and the blended vapour phase inhibitor releases a controlled mono molecular chemical into the atmosphere. It is attracted to all metals, both ferrous and non-ferrous, and it will not adhere to wood, plastic or glass. It is far more effective than using a silica gel - as silica dries out your woodwork causing potential problems later. One Super VP90 pouch will protect metal objects in a 1cubic metre storage place for 1 year. Larger areas may require more than one pack. You can also put one in your gun slip. VP90 must not be confused with silica gel or similar desiccants. These products simply dry out the air within the confined space and can lead to serious damage to wooden parts . It is safe to use on even the most delicate parts and will seek out exposed metal even in places that you cannot reach with the oil can. Anywhere air can penetrate VP90 will protect!! VP90 vapour deposits an invisible mono molecular film which bonds to any exposed metal surface and guards against the effects of corrosion and continues to do so even in extremes of temperature or humidity. If you value your items, VP90 sachets are a must have. It is supplied with full instructions in a sealed package, VP90 packs can be placed inside any cabinet with the adhesive tab provided. Independent test proves that VP90 really works. The Swedish National Testing and Research Institute have recently tested VP90 and it passed with flying colours.