I installed a new cedar fence and wanted to weather it so it would gray quickly. I bought a package of Eco Wood Treatment for $16 to make 1 gallon of solution. It advertised that not only would it gray the wood, but also protect it from decay. Because of its cost, I did some research on the web and found that this product isn't worth it. Rather, I bought a 1 lb package Ferrous Sulfate from Amazon (It is also sold in garden centers) and used it to age our fence. The ferrous sulfate reacts with the tannin in wood and grays it.
You can see from the photos below how a ferrous sulfate solution worked at making a fence gray. I used it on both a cedar and oak fence as shown.
Mix 2 oz (3 tbl.) of the ferrous sulfate in 1 gal of water. Then simply wet the wood you want to turn gray. In three days, your fence will be an attractive gray. People have also dissolved steel wool in vinegar to produce ferrous acetate which also will age wood in the same way ferrous sulfate does.
After you have grayed your fence, you can add rot and waterproofing protection by using Rust-Oleum's Woodlife Classic wood preservative. This clear formula repels water and contains nearly double the fungicide of standard sealers or stains. It can be used as a final finish or paint primer. This is the same sealer/preservative we used as a wood conditioner before painting. Of course all wood will breakdown in sunlight.
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