Yes, Please get it tested to make sure it is working, Many preservatives you have to wait until the temp of lotion is below 100 to add the preservative or you reduce its effectivness. Also if you are ;making goat milk lotion remember to pasturize your milk, I do this twice before using in lotions.
I use Phenonip which actually is better put in things at a higher temp (150-170) to insure dissolving into the product. They also reccomend adding half to the oil phase and half to the liquid phase as well.
This demonstrates that every preservative is different.