I have a pine log home in the gatineau hills Qubec, that is more than 100 year old. The logs are bare wood (no staining or protective products on it). I would like to apply a borax treatment (shell guard). will it be effective if I leave the logs the way they are? i.e, no washing with permachink products of dry blasting. Then should I fill the small holes and, if so, with what product. Thanks