I sprayed it on a blanket that I put in the pet carrier before I took my cat to the vets. He still cried in the taxi but not as much as before. He usually wees or defecates and it's only a five minute journey but this time he did not so I'm guessing it must be the spray working. He was still crying in the vets but I'm think it might be he doesn't like being in the cage as once he sees the vet he's as good as gold.
The cover though is useless so I didn't bother using it as it would fly about as it's flimsy although you could put garden tablecloth weights on the corners to hold it down.
I bought the feliway classic Travel pack and It came with a free Cat Cage Cover, It’s the best thing ever my cat is very nervous and the cover has worked very well as she hates going to the vets I recommend this product and It’s good value too