Re: soy based wood perservative

The only Pressure treated wood I have ever used is the real nasty copper arsenic stuff - and if you look at the little tag stapled on the end you will see that the guarantee requires you to return the whole uncut board with the tag attached for a refund claim.

I have built fences and outdoor structures from white and red pine, red and white cedar and from pressure treated lumber and there ain't much difference in durability one from the other.

The fungus that decays wood needs air and a little bit of water.  This condition exists at ground level so that is where the posts rot off.  Keep wood dry and it lasts forever (almost). 

All fences/decks last about 18 years.  Caps or slopes on tops of posts slow down end rot.  It keeps them dry. and setting posts in gravel so that critical area at ground level stays drier makes a more durable product.  

And as ct says, linseed oil or tung oil has been used for years to protect wooden farm machinery.  

If something has only been on the market for a year nobody can claim that it works as a preservative any better than anything else - or nothing.