Hi there,
Nice one. :)
The clay product I was referring to acts as a deterrent due to texture but it has an added benefit in that if they do decide to go over it, it dries them out and they don't reach their destination. This is the only thing I found that worked when I was trying to protect my hostas (well that and going out and hand picking them). I tried sharp gravel (that sort of worked) egg shells, etc. and then I found this but it has been years since I bought it and I don't have slug issues in Colorado. Well, I say that but recently with all our rain, I have seen some of the little buggers emerge but they are the tiny ones and easy enough to dispatch. A slug longer than your middle finger can decimate a full grown plant overnight.
At any rate, I empathize with anyone having to deal with slugs because of the immediate and complete damage they can deliver.
I am awaiting a call back or email from the garden center where I purchased this in Watford. Once I have it, I will post it here. It is amazing stuff.
All the best to you,
Benny