Green Products 33004 Copper Brown Wood Preservative for Surface Protection, 1-Quart

Copper Green/Brown is the ‘OG’ of end cut preservatives. The smell is ‘piercing’ but it WORKS! Many stores (like Home Depot) have quit carrying it, replacing it with a similar looking, less effective product (My humble opinion~) I am happy to find it here.

The best: As another reviewer has said, the oil based naphthenate is better than the water based. It penetrates deeper into the wood than its water based cousin. Both are superior to Boric Acid solutions, which do not penetrate nearly enough to be effective. Apply late in the after noon when the relative humidity is low to get maximum penetration. And the reviewer stated, oil based copper naphthenate is the best preservative available today. The worst: It has nauseating fumes. You will need to wear a quality respirator, like 3M's, and rubber gloves. You may have to leave your clothes outside after you finished as the fumes will permeate them. If you do not wear a respirator, expect to endure the deleterious effects of VOCs, like blain dabage.

Worked great. Now hope my fence posts last longer.

Meets all expectations.

It is now so hard to find a copper naptha product that I suppose we should feel lucky that Grreen's has managed to dodge the bullet so far. 20% copper is a thing of the past so I tried this. The copper green is also a good product but leaves the green color for years. I just stripped my bare wood home of 27 years with a pressure washer and treated it with iron sulphate which came out great. However some untreated window trim and the outer wall bottom edge needed extro protection. I'm amazed at how well this product is drawn into the wood. End grain will soak up about 3 inches in a couple of weeks. It also leaves the wood a dark brown which eventually turns into a medium brown. The oil should also help repell the water on the edges of the wood. I just dripped it with a dropper on the bottom edge (its too thick to spray with a garden sparayer) yet it soaked right in. It worked for me!

Seems to work as described, time will tell if the wood is prevented from rotting and insect infestation. Wood soaks it up fast, same with a repeat coat a few weeks later so it doesn't seem to get saturated by absorption. Very strong odor for a week or more, needs to be kept outdoors

Great stuff. Has a consistency thinner than water, but goes on easy enough with a brush if that's the way you need to do it. It really soaks into the wood, and quite fast. Yes it has a strong smell but i don't find it to be unpleasant. Time will tell on the effectiveness. If you are dip treating your wood, as recommended, buy more than you think you will need. As i said, it soaks in very well.

Product itself is great. BUT Amazon duped me.........I looked this up in my history, hit "buy again" but it put a smaller size in my cart! I bought this prior in gallon size, and it put a QUART in my cart.......yes, my fault for not checking the detail, but I never bought a quart-size before! Price was terrible!