I have a slow leak due to a spot in my truck tire. The tire needs to be replaced, the patch cannot be repaired, but the tire has 10,000 miles left. This inexpensive tool saved me a lot of money when I didn't change tires early. A bit slow to inflate but I'm used to a full size air compressor, my 40psi truck tires are light enough, takes 5-10 minutes to go from 20 to 40psi