Yes, but you'll need to put the dye in a spray bottle. The problem with pleather is that it's a plastic and most plastics tend to repel water. So if you dip or use a paint/foam brush, the dye will tend to bead up, like water drops, because the pleather is repelling the water in the mix (about 9% water). Not all pleathers do this, so you could do a test first. However, if you put the black dye in a spray bottle (the more it comes out like mist the better!), then the beads are too small and the coat is too fine for it to bead up. It will dry near instantly and will give great coverage. Just make sure to allow the dye to dry between coats. About 5 to 8 seconds between sprays for the best coverage. Also, black alcohol dye has a VERY unique property in that it has a red/brown sheen if it's too thick. So it's better to water it down and build up the coverage, than to apply too much black and have it shine red/brown. XD Good luck! 

I always find 91% at Walmart and pharmacy stores like CVS and Walgreens. Try those places?
It's worth finding. 91% gives WAY better color stay because it dries quicker, before it has time to drip off, so the color grabs a hold before dripping off. 70% and 50% tend to stay wet longer, so the ink just drips off and the scalp area ends up lacking in color. Good luck!

Good luck! It's one of the cheapest methods of dying, since a 4oz bottle of Pinata ink costs about $7.50, and lasts YEARS once you dilute it with 91%. WAY cheaper than harvesting sharpies, that's for sure! XD