Copper Naphthenate-Based Wood Preservatives
Perhaps the most common wood preservative available to DIYers, oil-based copper naphthenates are classified for general use by the EPA. It’s commonly used as a brush-on preservative for end cuts on pressure-treated lumber.
Per the EPA, copper naphthenates also protect above-ground and ground-contact wood against insect damage, with low toxicity for humans.
Copper-Green Brown Wood Preservative is a great example. Like oil-based paints, it goes on easy, cleans up with mineral spirits and doesn’t smell great when first applied. That lingering odor makes it a poor choice for interior projects, but it’s a good option for exterior projects like treating deck posts. The brown color looks good on more visible items like fence posts or landscaping timbers.
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