Do tire plugs last?
How long does a tire plug last? Companies claim that a properly installed plug can last seven to ten years or typically 25,000 miles, but that's not the case if there isn't a proper seal or if the plug hasn't been properly installed. via
Can you add air after Fix-a-Flat?
Yes. Fix-a-Flat will seal punctures up to ¼ inch and will fill the tire with enough air pressure to get you back on the road. Immediately, drive the car for at least 2 to 4 miles and visit a gas station (or use a tire inflator) to fill your tire with the proper amount of air pressure as soon as possible. via