Wood Care Systems provides Bor8 Rods, a solid preservative inserted into drilled holes. When the moisture content gets high enough in the wood to host decay, the rods dissolve and diffuse through the wood and will diffuse across glue lines. Bor8 Rods are 100% Boron and will arrest and prevent wood rot for 20 years or more. They are very safe to handle used extensively in utility poles railroad structures and have been around since the 1980's. Please contact us for further information.