After screwing around with a bunch of dyes (real dye) and not paint, I can say with 100% confidence that you can dye leather but MB tex is tough in the long run. As for cracks or cracks which border on tears, they make a filler which will not stick for long. It will 'crack' off from the area you replaced. Sort of think of Bondo but with a lot of flex issues going on. Now, if you can find real leather replacements, which has no cracks or deep cracks, then just re-dye them your color.