What will happen if you apply white paint on to a white shoes
Depending on the shade of white, hopefully it will blend in if it's just one spot. If you do the whole shoe and it's acrylic paint, it will chip and make the shoes worse.
your shoes will be painted white.
They will remain white.
It mostly depends on what type of paint. Not very likely you will like it though. Most will wear down or peel funny.