I've used both Bobbex and Plantskydd. I found Plantskydd unpleasant to use (pig and bovine blood), looked like a murder scene, and took too long to dry and become rain-fast. It needs 24 hours as I think I mentioned earlier. I sprayed it when there was no rain in the forecast but, of course, the forecast was wrong and it rained before it was dry and the deer munched happily on those hostas before I could respray
I've used Bobbex ever since and it has worked well and dries faster and is more pleasant to use although it still stinks initially but not like blood. In the study below rating the different repellents Bobbex came second only to a physical fence. Now it does say it needs re-spraying more often than some but that applies to other repellents too on plants where buds are continually developing since the last spray as opposed to slow growing evergreen shrubs for example.
Check out Table 3:
http://cdn2.hubspot.net/hub/12...