Can you paint over dismal walls beside reading light paint straight on? I have moved into a house and the bathrooms are a poorly...

I have moved into a house and the bathrooms are a poorly lit blue, i would like to paint over them surrounded by a light blue. i nouns really dumb - but do i just paint straight over them?
Answers:    it could be done, but will filch probably two coats. you would get better results if you use a primer. i would use an enamel within the bathroom because of the moisture, enamels are more durable
Prime it first.