Boracare should not be hard. When was this product purchased? Did you get this from us?
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Boracare is not meant to be used as soil treatment product and should not be used in that way. Boracare is only labeld to treat termites, wood destroying insects, powderpost beetles on raw undtreated wood. For preventative treatments, mix at 5:1 ratio and 1:1 ratio for active treatments.
Termidor SC is the best product for soil barrier treatments and will last 10 years in the soil. Please take a look at Termite Control Articles here and How To Do Your Own Termite Treatment Article for more detailed information.
For an active Drywood termite infestation, mix 1 gallon of BoraCare with 1 gallon of water.
One gallon of Bora-Care will treat approximately 100 lineal feet of 2 x 4 stud wall. Typically, one gallon of concentrate Bora-Care will treat 800 square feet of a 2x4 stud wall, and 500 square feet of a crawl space or attic.
Depending on how big of an area and what specifically you are treating for drywood termites (floors, furniture, crawlspace,etc) will depend on how much BoraCare to use.
It would be recommended to complete any sanding/planing before applying Boracare.
Both of the treatments mentioned in previous Q&A's for Boracare are correct as they are for 2 different application methods. If you are drilling directly into the stud you would follow the instructions of drilling every 6 inches and inject. If you want to foam into a wall void instead then you would follow the drill at the top and bottom on each side of the stud instructions.
Boracare must be applied to raw wood in order for the product to be effective and for it to be absorbed by the wood, so the trunk would have to be sanded if it's painted/stained. If Boracare is only applied to one small area, it would only go up a couple of inches or so. You can use Jecta instead to inject it into the wood, it is a ready to use form of Boracare, but holes must be drilled in order to inject the product into the wood. If these options are not something you want to do because it is an antique, you can speak to an antique dealer for recommendation or have the trunk fumigated by professionals.
Are you trying to treat an active infestation of something or prevention?