Hello. I work in a field where most of our time is spent in the brush. While this isn't about hiking and camping specifically, the overlap is significant! Is there any kind of poison ivy protection in the form of a spray or cream, like insect repellent or sunscreen? Something that offers continuous protection throughout the day? Most of the time we don't know when we have been in touch with poison ivy. Hence the need for continuous protection.
In fact, our equipment is frequently riddled with poison ivy oils. It's common that people get poison ivy rashes from the equipment rather than being in touch with the plant itself! Whenever we're in doubt, we use alcohol. Lots of it. Half the time we smell like we've just come back from a night out.
I figured if anyone would know, it would be the camping crowd.