Give me the full description the chemical

Tenino has 2% copper in it (which puts it at around 18% copper napthanate). The Rust-Oleum (with 9.2% copper napthanate) has 1% copper. And the Copper Green brand( at 10% copper napthanate) has 1.18% copper. Napthanate is essentially an acid and kills stuff instantly. The 'copper' technically a type of salt that's derived from the napthanate. The more copper napthanate 'salt' the deadlier (though even a small amount will kill life over time. Unlike table salt, these copper 'salts' won't readily wash away with water. They're non-water soluble and quickly crystallize in the pours of the wood, leaving a very long lasting protectorant against organic life forms (ants, wasps, termites and every kind of fungus). No matter how you do the math, within reason, the more of this stuff you apply the more salt will remain. The napthanate solution is super-fast drying... less than an hour (though it'll continue to out-gas for a week or more). On dry wood it's easy to get two and even three wet brush-strokes to soak-in from a single coating. So, using even the weakest solution (the Rust-Oleum) on dry wood might result in 3% or more of salt that got into the pours in one application. Wet wood would not absorb it deeply, but the salt would coat the surface (and crystalize into the topical pours) at a full 1%. The point is, even .5% of nathanate salt would kill anything that contacts it for a life time. Lastly, it seems like a lot of people want to get a lot of deep penetration. But, unless abrasion is an issue: such as foot traffic or trailer boards where loads will abrade the surface or wood rot may have already started, penetration is of minimal concern. It's like sprinkling cyanide granules on a hamburger versus mixing it in to the meat. It simply won't make a difference.

Must you paint wood that's been treated with Tenino with an oil based primer? Can you then put a topcoat of water based paint? What paints are best?

No further treatment, primer or coating is necessary. If further coatings of additional paints, primers, etc., are desired for best results we must recommend the use of an oil base product. The hydrophobic properties of the carrier (inactive ingredients) may produce undesirable results if a water borne product is overlaid.

Approx how much surface area can be treated with one gallon and can it be applied with a sprayer?

I used a gallon to build 8 4'x10'x10" raised garden beds. It covered about 160 sq ft. I used a paint brush to apply it to all surfaces that are in contact with the soil. I don't see why a sprayer wouldn't work, but it does create a strong green stain that probably wouldn't wash off. One year in the ground and no signs of rot.

what does this look like aged on PT? any pics?

Assuming that by PT you are asking about pressure treated lumber the answer varies. Lumber pressure treated with copper naphthenate should have very little coloration variance after supplemental treatment with Tenino. This should be applicable to a lesser degree for most metallic copper based pressure treatment systems. However, without knowing the exact species and pressure treatment system and retention levels it would be impossible to be more specific.

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Tenino Copper Naphthenate 17% (2% as Metal) - 1 Gallon - Wood Preservative

Tenino Copper Naphthenate 17% (2% as Metal) - 1 Gallon - Wood Preservative

Product ID: 691999121

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Details

Colour
Copper
Brand
Tenino
Surface Recommendation
Metal Wood
Material
Copper Metal
Model Name
CCWP

🌿Low VOC <350g/L, eco-conscious formula

🪵Covers 100-300 sq ft per gallon, ready-to-use

🛡️2% copper metal for superior wood defense

Description

🛠️ Fortify your wood, protect your legacy!

ECO SMART FORMULA - Low VOC and made from 100% recycled copper and reclaimed by-products
ULTIMATE WOOD ARMOR - Protects against termites, beetles, fungi, and decay for long-lasting durability
CODE READY COMPLIANCE - Meets AWPA M4 & building codes IBC 2303.1.9 & IRC R317.1.1 for end-cut treatments
EFFORTLESS APPLICATION - Ready-to-use oil-borne solution, no mixing needed, brush on and go
VERSATILE OUTDOOR SHIELD - Ideal for lumber, fences, decks, poles, docks, and more—prevents warping and moisture damage

Tenino Copper Naphthenate 17% is a ready-to-use, oil-borne wood preservative containing 2% copper metal that meets stringent AWPA M4 standards and key building codes. It offers broad-spectrum protection against termites, fungi, and wood-destroying insects while repelling moisture and preventing warping. With a low VOC formula made from recycled materials, it’s the eco-conscious choice for extending the life of exterior wood surfaces, covering 100-300 sq ft per gallon with easy brush application.

Specifications

Colour	Copper
Brand	Tenino
Surface Recommendation	Metal, Wood
Material	Copper,Metal
Model Name	CCWP
Size	Gallon
Coating Description	Oil-borne Copper Naphthenate coating
Item dimensions L x W x H	17.8 x 10.2 x 29.2 Centimeters
Item Weight	3.72 kg
Finish Type	Copper,Metal
Recommended Uses For Product	exterior
Liquid Volume	1 Gallons
Number of Items	1
Manufacturer	Copper Care Wood Preservatives, Inc.
Net Quantity	128 Fl Oz
UPC	850098004073
Item model number	CCWP1090-1GAL
Product Dimensions	17.78 x 10.16 x 29.21 cm; 3.72 kg
ASIN	B0147OQQ84

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