is there anyway to stop a crack in a?

Yes, if it is not too big already. Auto glass places use the Novus system, about $100, to repair cracks and the results are guaranteed for the life of the windshield. The current standard is if the crack can be covered by a dollar bill it can be repaired. There are exceptions - if there are two stars close together that have cracked into each other they will not repair it. If you try to fix it yourself the crack becomes contaminated and they can't fix it.

If it's just a small chip or spiderweb crack in the windshield, then that can be fixed using a resin compound that bonds the glass back together. I've seen the kits at some auto parts stores, and some garages offer this service (my local Jiffy Lube even does it). Or you can call a company like Safelite, who will come to you and fix it.

My experience has been that once the glass has cracked away from the original point of impact more than a couple inches, you can't repair it. The only thing you can do is keep the car away from extreme temperature changes. And whatever you do, don't pour hot water on the glass if you have ice buildup on it.

If you have insurance, and the crack is within the driver's line of sight, your state may require the insurance company to replace the windshield. You can call your insurance company's toll-free number to ask about that.

No.

You can fix a bullseye but not a crack. Insurance companies wold love the fix a windshield crack from spreading. Multimillion $$$ business.

The problem is not the temporary fix if you keep the car in the garage. But if you drive it you may not notice but the whole vehicle is shaking from road impacts, steering and so on. If the suspension feels it than the windshield feels it too.

You may be surprised but the windshield and the back glass are part of the structure of the vehicle and it does absorb impacts just like any other structure part on the vehicle.

Not worth the trouble except for stars and bubbles fixed by http://www.safelite.com/ Your passenger side front air bag needs a strong windshield to work against. Your auto comprehensive coverage insurance covers the cost except for a deductible. SafeLite's mobile service comes right to your door. If the windshield is many years old, it needs replacing anyways due to general wear and tear.

Repair at a shop. Nail polish in a bind. Yes there is. Takes a pro to do. They need to drill at each end of the crack. Dry it,vacuum it. Inject something. And then put pressure on it. And then apply a special light over that to set the stuff they use. It is not something you see on the general market.

99% will eventually spread. A pro could fill with clear epoxy that might stop it for a while, but a crack can't be repaired as easily as a chip.

Clear nail polish, inside and out seal the crack, no water, no continuing crack.

Had a rock hit and used this, lasted two years, until a hail storm really did it in.