PA Orange killed one of my dropper bulbs, turned it into a sticky goo. Citrus oil is powerful stuff.
Yea, I had the same expereience with PA orange as well. I had to trash my syringe after mixing the flavoring. I have not had the problem with key lime though. But I use PA keylime, which is not oil based. I
vape alot of it.. LOVE it. I mix in about 2-3% ghram cracker crust, and makes it taste even better.
If you must use a syringe, invest in a glass syringe. Yes, they can get pricey, but they will last forever as long as you don't drop/break them.