No, they would only paint as far as you pay them to paint! painting the entire shell inside out could take up to 2/3 times longer than a regular repaint, and easily double what you spend on paint and materials, let alone the extra labour cost... unless you want a cheap and cheerful colour change, where quality isn't that important, or you have the funds available for a full blown show standard paint, then it really is more trouble than its worth
Thom