Works as Promised
In the past, I have used Locktite's product, but was not overly impressed. Even though the Fix-a-Windshield product primarily is designed for chips and not cracks, it worked pretty well on a 7-inch crack in my windshield. Basically, I followed the instructions for fixing cracks, but made sure that I used the injector device for the original impact point and at the end of the crack. Fix-a-Windshield is not perfect -- the crack is still visible, but it is easy to use and works well. Previous cracks of about the same size have tended to spread, but this one seems to be stable. Is that attributable to this product? Well, there's no way that I can know for sure, but I'm happy to give Fix-a-Windshield credit.

Excellent product...still working since 2006!!!
I purchased and used this item since July 2006 to fix a star-burst on my windscreen. Back in 2006, there was no-one in my area who repaired windscreens. The same day I ordered this kit, the star-burst expanded to a 7-inch crack! (I rolled my windows all the way up, and left the car in the sun.) When I got the kit, I applied it (after reading, and re-reading the instructions). I was happy then, and now 2 years later I am still happy and a bit surprised. To be honest, I really didn't expect that repair to hold this long. The crack has not expanded. I saved a lot of money by not having to replace my windscreen. Since then, I have used up all of the resin repairing little nicks/chips that come with driving.

This kit is an excellent product. It would have been great if the manufacturer sold the resin separately as well. I still have all the other components of my first kit (except resin), but I now have to purchase another kit to repair a crack on my husband's vehicle.

Results may vary.
The one thing that this product doesn't stress enough is that your results may very depending on the type of damage you have. This product is not very good on star cracks or regular cracks (it may work better on bullseyes). I have a star crack about 1.25" in diameter with the longest crack extending about 3/4 inch from the point of impact. I've read and fallowed the instructions 3 times and after few tries the product did fill in the small spider web like cracks that extend no longer then 1/4" from the point of impact but the longer cracks are still there and still visible. The damage does look a little bit better then before the repair but it's definitely nothing like the Before and After picture the manufacturer provides. Honestly I don't really care how it looks as long as it passes the state inspection but I'll find that out in few months.

Overall I can only give this product 2 stars, and if you are going to buy this don't expect miracles.

Fix-A-Windsheild
I had a small chip to repair product did not work that good, can still see chip as before repair.

Should work, in theory
[Sorry, have to edit this review. Just DISREGARD everything I said in the original review about the competing product from Permatex. They have CHANGED the product so much that it is now, in my opinion, almost useless for a good repair. Given the change in the competing product, I would choose this one (Fix-a-Windshield) any day. I'll leave a quick review of the Permatex product changes on that page.]

First, let me say that I'm an engineer and also a big DIY-er. Ok, got that out of the way.

In theory, this should product should work. In practice, it will probably take a lot of practice to get good results. This review comes after only using the product once, on a 3/4" star I just got two days ago from a kicked up rock. The end result, after about 45 minutes of fiddling with this product, was the star was only one-half filled. I simply could not get the fluid to fill the rest of the star, despite following all the instructions exactly and also taking into consideration the suggestions I read from reviewers here ahead of time.

I've had _much_ better results with the Permatex product. Yes, I know that product has not gotten good ratings, but I can offer a theory why it might work better than this product.

This product relies on _compression_ (high pressure) to fill the cracks. The Permatex product relies on a _vacuum_ (low pressure). This product has a very small orifice through which to exert its compressive force. Normally, that would be a good thing, but only if the only entry point in the glass is within that small area. The instructions say to make sure the mouth of the tube opens wide. Well, what's "wide"? Two times the original? Three times? Even at three times its original diameter, this product can only cover perhaps 1/2 of the surface area that the Permatex product can. The Permatex product I'm referring to has a single suction cup with a hole in the center, to which a syringe attaches. The syringe is filled with the resin. Then, you pull back on the syringe, and watch bubbles pull out of the crack. You abruptly release the syringe and the fluid is forced into the vacuum created by the first action (pulling back the syringe). Still with me? The area which the suction cup covers is _at least_ twice that of this Fix-a-Windshield product. So....if you need to fill a crack, you have twice the area on the glass to find a hole through which to inject the resin.

I think the reason that only 1/2 of my star would fill is because that air could not be drawn from the very center of the star to those points. The pathways were somehow blocked. If the "mouth" of the tube were larger, I would have had more possible entry points for the resin to penetrate.

Regarding the product quality: the suction cups are _great_. The plastic and rubber materials seem to be pretty good. I think they should have included a bit more resin. However, there is considerable play in the plastic threads holding the injection tube to the central frame connected to the suction cups. That allows the tube to move on the glass. That might be a good thing, but I saw it as a bad, since (I think) it reduces the quality of the seal.

I'll give this product three stars, but you should consider it 2 1/2. I plan to go buy the Permatex product now to see if there's any way I can fill the rest of the star, now that the resin has hardened from today's attempted repair.