2 x Silent Roar - Cat Repellent - 0.5kg

I've thought about getting this. As cats are coming in my garden and attacking my cat. Will this make my cat not want to come in her own garden?

I put the first batch down yesterday but the cat walked past it this morning. Does it have to become wet to give off the smell to deter cats ?

Is it suitable for lawned area or does it burn the grass ?

Does this work on foxes?