Once fitted instant results. Life is so much easier not having to clear bird poo away every day. The fitter said a recent H&S course he had attended said the bird poo was more toxic than asbestos somglad we got them.
Just the job, to deter pigeons from roosting on my house side, not fitted yet, but am happy with the whole package of spikes and adhesive. Good value, and very well packaged, no damage, and delivered in good time.