You need to make sure the paint is formulated to work on the substrate you are using–not all “acrylic” paints will work on all materials.
If you are working with leather, Angelus is quite good. I’ve also used it on wood, too.
Apart from leather specific paint, usually the better brands you will find at art supply stores, next step down is places like Michaels… If you’re lucky to be close to an “Artist & Craftsman Supply” store, GO! It’s a great chain & really good prices.