Bora-Care is always the recommended product for treating active Powderpost Beetles because it penetrates deeper into the wood, up to 8 inches with 2 applications. Timbor will only go about 1/4 inch so it will not get to the larvae already in the wood. Bora-Care can take up to 30 days or more to penetrate all the way through a piece of wood and this will vary depending on how thick the wood is and the moisture content. We would recommend applying the Bora-Care and not a second application of Timbor. The larvae stage in the life of the Powderpost beetle is the longest, lasting from 1 to 10 years before it will mature to adulthood so it can take time to completely erradicate them.
Please take a moment to read over our article on How to Get Rid of Powderpost Beetles.
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Boracare does need to be diluted depending on what you are intending to use the product for. For an active infestation of a wood destroying insect, you will use 1 gallon of hot water with 1 gallon of Boracare. The percentage of active ingredient is 23% in that dilution.
2:1 parts water to Boracare – 16% - foaming or misting application for termites or carpenter ants; hardwood floors for some wood-infesting beetles
3:1 parts water to Boracare – 13% - remedial control of Fungi and Algae on wood less than 4 inches thick
5:1 parts water to Boracare – 9% - most preventative or pre-construction treatments.