I put it in the jar ( that I'm going to leave it in) with a little oil and use an electric hot air gun ( into the top of the jar) to melt and mix, heat until a clear liquid. Let it cool and if it solidifies add a bit more oil and repeat until it remains a thick, tacky liquid at room temperature. If you buy a "soft" rosin it already has oil mixed in so should be easier and quicker.
Regards
Hugh
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