Jon, I've posted before that it's the same active ingredient that's in 'poly 60', just more watered down. As the chemical is the same, it will do the same job, but you need to use more to do the same job (provide the same protection). In fact, you have to use 1.5 qts to do what 1 qt of 'poly 60' would do. As you have a supply of the 40%, use it (x 1.5) to do the same thing as the 60%
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