How do i make something painted with watercolour waterproof? ?

Question

i just made a keycharm for my best friend out of air drying clay and painted it using water colours because i do not have other paints at the moment , what can i coat on top of it to make it waterproof so that the colours do not smudge when you touch it with wet hands ?

Answer 1

you can coat it in varnish or lacquer

Answer 2

hairspray and clear glue!

Answer 3

Try dipping it in a oil based cover.