There are aerosol cans that will inflate tires, and spread some gunk around inside to provide a temporary fix. This is a limited repair option--these cans work only on punctures in the tread, not on the sidewall of a tire.

Don't drive fast on a high-pressure spare. Your owner's manual (and sometimes the side of the tire) will indicate the top speed that the tire can sustain. Replace a high-pressure tire as soon as possible.

2torial #0621: Learn2 Change a Flat Tire (Continued) Loosen the lug nuts If you try to loosen the lug nuts after jacking up the car, the wheel will just spin on you. Loosen those nuts now and make it easier on yourself. There are generally four or five lug nuts near the center of a wheel. Sometimes they're hidden under a hubcap, or a plate that needs to be pried loose. If this is the case, use the flat end of the lug wrench (or jack handle). Insert it into the slot provided at the edge of the plate, or at the edge of the hubcap. Pry the plate or hubcap off and don't let them roll away. Now that you've removed the hubcap, find the end of the wrench that fits properly. Place it over any of the lug nuts. Turn counter-clockwise to loosen the nut. Do you have the cross-shaped lug nut wrench? If so, grab the opposite ends of the wrench. Use that leverage to loosen the lug nuts. Many people have trouble removing very firmly tightened lug nuts. If you're in that situation, here are a few strategies to help loosen them. Steady the wrench with your hand if possible, and step down hard on one end of the wrench with your foot. Place your foot carefully onto the wrench. Holding onto the car, step with your full weight onto one end of the wrench. Bounce up and down on that end until the nut loosens. Find a rock. Hammer on the end of wrench with it. Once the nut has loosend and turns more readily, continue turning the wrench until a few remaining turns with your hand will release it. Repeat the process with the remaining lug nuts. Note: Leave the lug nut on the threaded shaft. Step 4