I have yet to meet anyone that has a found a way to stop urine burn patches and I know a lot of dog people, best solution is to pour water where dog has peed just after is has happened
Not sure whether we were using ours right but didnt find they worked, his urine still wrecked the lawn! The best thing for us was to pour a jug of water over where he had just weed, but obviously this cant be done every single time but it does reduce the amount of patches if you remember to water when you can!