UKADEX Feather Peck STOP is a French product and the description - “bombe repulsive” - does sounds much more effective than anti-peck spray!
UKADEX has a very strong odour. It has repulsive effects and helps preventing biting and canablism.
UKADEX spray has a very strong smell BUT it works quite well and in 99% of the times stops feather plucking or biting within 1 week only!!!
To use this spray, first put disposable glove on (trust me you will need them) then spray on the bird that is having its feathers plucked, dont be shy spray for about 3-5 seconds all around the affected area. Repeat the spraying every 3-5 days until it stops. (This normally stops very very quickly).