Copper Naphthenate is the best wood preservative available to contractors and do-it yourself consumers. It is perfect for use when wood will be in contact with the ground and as an end cut treatment when you cut pressure treated wood.
Copper naphthenate is available at many building supply stores and hardware stores.
A 2% oil-borne preservative that can be used in the field as a brush on application for end-cuts, dap cuts, drill holes and other applications where treated wood needs protection.
PenaShield is a ready-to-use formula that can be sprayed or brushed on raw wood. It is a unique patented preservative that penetrates the wood, delivering long-lasting protection.