I used the same filler this weekend on some cracks in my dash (largest was ~2"s long and ~1/8" wide). The material did a great job, however I will point out that it seems to be water-based, like their dye. The filler I used had dried in 24h, but didn't seem to have actually cured, so it was still easy to lift off when applying the dye. When you reapply the dye, I found you needed to use a very dry brush for the first couple of coats, to try to prevent the filler from lifting. My repairs didn't come out perfect, the crack is still visible because it's sitting a tiny bit below the top of the dash (maybe 1/32" or less). I'm thinking after everything has a chance to cure for a couple of months, I may try a second application of filler, and wet sand the dye with very fine grit paper to remove some brush strokes that I caused by getting in too much of a hurry.

Time will tell if the filler is going to crack again or not. It does seem to try to a flexible state, so hopefully it wont.

Will still get a write-up together when I have more time & energy.