Cracks (I used two of these sets) have been partially filled. I followed the instructions exactly. I gave it a bit more time to push the product through and even cut out a tighter notch to give it more "push" power. Nevertheless, the bullseye was only filled in the main. One had two small 1/4 inch or so cracks radiating from it and they weren't completely filled either. Chances are they won't be traveling now and I think for the money compared to pros I was worth it but don't expect pro results.
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