I once repaired a W123 dash using the crack filler provided by Color Plus. Their crack filler is similiar to spackle so before the filler got hard I took a small piece of the dash vinyl from the bottom of the dash and lightly pressed it into the crack filler to give it the same texture as the rest of the dash. I then dyed the dash with the dye from Color Plus. Its like the crack was never there. This was a small crack and I doubt that the filler would work on large or multiple cracks - after installation in the car it would probably re-crack.