Corrosion Block is a state-of-the-art, anti-corrosion/lubricant compound that has been specifically designed for marine use. It is a clean, clear, ultra-thin fluid compound which leaves a non-greasy atmospheric barrier to protect metals. Because it leaves no gummy residue to trap moisture, lint, or dirt, Corrosion Block is perfect for protecting electrical systems, electronics, fishing tackle, and other gear. Key Benefits: Entirely nonconductive - can be applied to any circuit without fear, Safe to rubbers and plastics - won't melt your o-rings and gaskets, Long protection life - lasts from 6 months to 1 year, depending on application, Preventative maintenance - protect your equipment now before it's permananently damaged, and Includes spray attachment. Available in 4 oz. & 12 oz. sizes.