My car tires have a slow leak where the wheel rim meets the tire. I had a tire shop take the tires off and clean the rims and put the tires back on with bead sealant but it doesn’t last very long and then the tires slowly lose air. While doing research to see about using Fix-A-Flat or Slime tire sealants as a permanent solution I found the following information.
From the people at Slime: “Our sealants are a temporary repair for punctures in the tread area of the tire. They are not meant for bead or valve leaks or sidewall punctures.”
And from the Fix-A-Flat website FAQ: "Can Fix-A-Flat® freeze? Yes, if the temperature falls below 32 degrees Fahrenheit it will freeze. If the product is in the tire, and freezing weather is predicted, then immediately take the vehicle to a qualified tire professional for repair.