Vince:
I think I have a better idea.
What you COULD do is simply drill a hole into each leg and insert a borate rod, and then tap a small cork or stopper over the hole. Borates are very effective against a wide variety of fungii, including those fungii that feed on wood and cause it to rot. However, they're not harmful to mammals. We even wash our clothes with one form of borates called "Borax", which you can find in the laundry detergent aisle of any supermarket.
The way borates work is that they're very highly soluble in water. So they're inserted into holes in dry wood where they remain inactive as long as the wood stays dry. However if the wood gets wet, then the borate dissolves in that water and diffuses throughout the wet wood, thereby protecting that wet wood from wood rot. That's the only time you need protection as dry wood won't rot.
And, in this situation the borates will remain inside the wood since as the wood dries out, the borates will remain behind in the wood cells to keep the wood protected against wood rot.
Typically borate rods are sold as either "Impel rods" or "Cobra rods". Cobra rods also have some copper hydroxide in them which coats the surface of the hole once the borates dissolve completely. Since rain water can collect in this hole, the copper (which is a natural biocide) provides additional protection to protect the wood at that spot.
Borate treatment is popular amongst people who own log homes because of the ability of borates to diffuse throughout wood. Borate treatement is the only way of protecting the whole log because the borates will diffuse throughout the wood as long as there's moisture present through which it can diffuse. No other wood preservative will diffuse through wood like this.
I use Impel rods in the wooden window frames in my building to protect them from wood rot.
Just Google "Impel rods" or "Cobra rods" or "borate wood preservatives" and you should find lots of information on, and people selling these products.