I got this for my broken car key, long story short. this made it too rich to start the car. The key no longer fits. After reading so many reviews I was sure that just being stuck with a $20 disappointment wouldn't be a problem - I managed to make some of this and adapt it to my needs. It's also very well made, but just for me and what I need. misguided. This works great if the house key is broken or something similar. Not cars.