CrealCritter
Sustainability Master
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I'm assuming you have to paint all the surfaces with the saltwater/borax? Would you need to redo it occasionally?
Best to spray though, since it can get into cracks and crevices. I use a 3 gallon pump sprayer, like you would use in the garden.
If the surfaces are exposed to the weather, then yes you'll need to recoat often. But works well for interior framining members and should last many years.
You want a very salty water brine then add some borax. Make sure it's all desloved in hot water.