Walmart's Answer

Here is the $10 kit I purchased.

Bullseye

This is the rock chip I was tasked to repair.

Mounting

After removing any potential small glass particles from the chip, one mounts the device, centering it on the center of the bullseye.

Adding Glue

After mounting the device, the compression portion is removed, and glue added into the chamber. The compression portion is then added which, as it screws in, forces the glue into the chip.

Screwing It Down

Here the compression portion is re-inserted, forcing glue into crack (in theory).

Thoughts

After thinking about the type of chip we had here, and what this kit was doing, I determined that there was no way this was going to work. So, I attempted to pull a vacuum to draw air out of the bullseye and allow glue to be introduced into the cavity.

Coverage

After several iterations of removing the compressor, adding glue, re-inserting the compressor, etc., the last step was to place a small mylar sheet over the bullseye and set it in the sun to cure.

Scraping

After curing, the mylar sheet is removed, and a razor blade is used to scrape excess glue from the window surface.

Results

It looks exactly like it did before I used the kit. By now, I'd determined that this kit will never work with this kind of rock chip, and there is a reason that the picture on the back of the carton is a spidered chip: It allows air trapped inside the bullseye to escape as the glue is compressed into it. I wanted another shot at this kind of chip, and as luck would have it, my truck has several!

Starting Point

Here is a nice, spidered rock chip in my windshield.

Mounted

After removing small bits of glass from the center of the bullseye, the device is mounted, glue introduced and compressed into the chip, and then the device removed (once satisfied that the chip is saturated with glue).

Mylar

Mylar is again placed over the chip, and then the car is rolled into direct sunlight to cure the glue.

Not Bad

From this angle, it looks like there's been a VERY notable improvement!

Illusions

But the improvements aren't quite as dramatic as it first seemed. Granted, the chipped area does look better, but it's a far cry from the image seen on the container of the repair kit! Bottom line: Don't waste your money, have it professionally done.