Wood Preservation
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- Borate compounds - [1]
- Charring with a torch
- Ferrous sulphate
- Potassium silicate - paints - Wikipedia [2]. Also sol-silicate paints.
- Sodium silicate -waterglass - [3]. FPL work in Madison, with soak then 2.5% phosphoric acid to polymerize water glass.
- Good info here: https://permies.com/t/42996/Wood-Preservatives
Iron Sulphate - this says cost is $0.01/sqft: http://buildingtree.ca/products-page/concrete-finishes/ferrous-sulphate-powder/
Another brand/supplier: http://www.valhalco.com/why-use-lifetime-wood-stain.php