Paint is a liquid you can buy that you can use to change the colour of something. Paint goes on when it is wet, so you need to wait for it to dry. Some paints come in small, dry blocks and you need to wet them with water to be able to use them. You use a paintbrush to paint with.
Something is quaint when it has a certain old-fashioned charm, or if it is interesting in a nice way but a little strange too.