How many years of protection is the Board Defense borate powder rated for?

The Board Defense powder is designed to be used as a first step to our System Three EndRot System to make sure wood destroying organisms are killed before the wood is repaired and patched. It is effective in destroying any decay, insect, or fungi in the instant it is applied and can last for a few months without any other protection. For long lasting repair and protection, please check our EndRot system.