i use acrylic. it's best for adidas shoes. you also need to wipe the shoes with nail polish remover just to rid of the factory protective coating on the leather so the paint will stick.
i still wear the "ping pong" ones a little bit of cracks here and there but theyre in general good condition. custom kix are not for everyday hardcore work use. just keep em clean when you wear em to keep em fresh always
. peace. btw i like your shirt prints great job