Tenino Copper Naphthenate 17% (2% Metal) Double Strength — 1 Gallon Wood Preservative

Overview

Tenino Copper Naphthenate 17% (2% as copper metal) is a ready-to-use, oil-borne wood preservative designed for exterior applications. Packaged in a sturdy 1-gallon resealable jug, it brushes on quickly, covers roughly 100–300 sq ft per gallon depending on wood type and surface condition, and does not require mixing or dilution.

This treatment is formulated to protect wood from common threats and environmental stressors, while remaining compliant with industry standards. It is labeled for General Use and is intended for exterior wood projects where moisture, pests, and weather can impact performance over time.

Highlights and key benefits

• Ready-to-use with no mixing required for fast, efficient application
• Contains 2% copper as metal for durable, continuous protection
• Low VOC (<350 g/L) and 100% domestically sourced from recycled copper and reclaimed by-products
• Meets AWPA M4 standard and supports end-cut requirements for exterior and ground-contact wood
• Water-repellant properties that can help resist warping, swelling, shrinking, and end checking due to moisture changes
• Labeled for General Use and compatible with various wood products used outdoors

Ideal applications and real-world use

Designed for exterior wood protection, Tenino is suitable for both remedial and preventive treatment of standing wooden poles, piling, and other structures, as well as common outdoor wood items such as lumber end-cuts, posts, rails, fencing, siding, roofs, shingles, porches, steps, and decorative outdoor pieces. It can also be used on landscape timbers, window boxes, planter boxes, and other ornamental wood features.

• End-cuts and ground-contact wood in construction projects
• Posts, poles, fencing components, and beam work
• Shingles, shakes, cedar products, and outdoor decor

How to apply and important considerations

Apply with a brush to clean, dry wood. The product is ready-to-use, so no dilution is needed. Coverage will vary by surface texture and wood type. Exterior use only; always follow label directions for safety, disposal, and local regulations.

Environmental and regulatory context

Tenino’s formulation aligns with AWPA Use Category 4,4B,4C environments and is designed to complement pressure-treated wood protection. It emphasizes a low VOC profile and domestic sourcing from recycled copper. Treated wood may be disposed of in local landfills per regional guidelines, and the product supports code compliance for end-cut treatments in building projects.

If you’re exploring practical protection for outdoor wood, Tenino offers a ready-to-apply option that balances performance with environmental considerations, keeping your projects enduring through seasons and exposure.