If you have an active infestation of termites, powder-post beetles or wood borers deep inside the wood then Timbor would not make it through the wood to kill these insects, up to 4 inches with one application or 8 with 2 appliations. BoraCare is a liquid borate but has an additive, a glycol solution, which allows the product to penetrate through the entire piece of wood, therefore it should be used any time you have an active infestation because you are guaranteed it will kill anything in the wood no matter how deep it is. Also, BoraCare will last forever in the wood so you will never have to worry about any infestations in the wood that you treat ever again.
Timbor should only be used on raw wood that ideally is new. Timbor is not water repellant and it will not take care of any rot or mold on the wood. Timbor will only penetrate 1/4 of an inch into the wood and will leave a visible white residue on the surface. Boracare or Boracare with Mold Care would be your best options. As with Timbor, the Boracare will need to be applied to raw natural wood but it can be old or new. The Boracare will penetrate all the way into the wood and will not leave a visible residue on the surface. If the wood is going to continue to be exposed to the outdoor elements, you will need to seal it with a stain or finish of some sort to protect it. If you do this, the Boracare will last for the life of the wood. Boracare will treat and prevent (depending on the rate you use to dilute it) for wood destroying insects such as powderpost beetles, termites, and carpenter ants, as well as wood destroying fungus/rot. The Boracare with Mold Care will cover all of these same preventative measures and it also kills and prevents mold. Please take a look at the Boracare product label for exact instructions for use. You can also reference our article on How To Treat For Dry/Wood Rot.
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Timbor will only penetrate 1/4 of an inch into the wood and will leave a visible white residue on the surface. You may simply dust it off before applying the stain. If you are wanting a product that does not leave a white residue and absorbs completely through the wood, we recommend BoraCare. BoraCare will penetrate all the way into the wood and will not leave a visible residue on the surface.