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Keeping rosin (pine sap) hardened? Answered

I just finished making a prop for halloween that involves melting down pine sap to make rosin. Everything went as planned except it slowly becomes misshapen if it is above 70 F 
does anyone know of a way to keep the rosin hard?

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bwrussell

2 years ago

Look into how rosin for sting instrument bows is made. I've never had any I've owned melt or go soft. I also tend to keep my instrument and equipment out of extreme temps but I'm sure its been above 70F before.

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Yonatan24

2 years ago

Is there a chance that you can cover it with clear epoxy on the outside (with a paintbrush, or something like that)?

Similar to lacquer, I think it will add strength too...

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Downunder35m

2 years ago

AFAIK it always goes soft with elevated temperatures.
Here in "The land downunder" we often used already dried pine resing as some sort of bushman's glue for everything.
Never tried boiling it down as I think it needs the natural hardening to become really good....
Anyway, as a really strong glue that even fixes holes in your water canister the dried resin is melted down in a can or small pot and then fine charcoal is added until it has a putty like texture insted of this sticky oily one when heated.
Once that mix is cooled down it is rock hard and will tolerate the high temps in the AU bish (45°C+).