When mixing terpenes and shatter it is important to not use a ratio of terpenes greater than 10%. I recommend using 5% terpenes by weight compared to the shatter.
First decarb the shatter at 250 degrees Farenhight for about 30 minutes or longer, watch for the small bubbles to stop forming. Then add in the terpenes and stir or shake the mixture until evenly mixed. Then you can use a syringe to pull the liquid up and inject it into your vape carts.
You can see this video for more info:
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