Hi Steve.
I have had a stock of rosin for some time so I don't know where to get it now but the Stockholm tar can be bought from most vet supply stores or saddlery/equestrian supplies. I use 7 parts rosin to 1 part S/t for 20° temp. An extra teaspoon of tar will soften 1 ltr mix a reasonable amount.
I'm sure it would work with pitch.
Dave
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