I graduated 8 months ago, got hired full-time a month later under a good boss. I enjoy the work and my co-workers (the company as a whole leaves something to be desired, but that's beside the point.) I was recently contacted by a recruiter looking for someone to do some part-time work. I met with the recruiter and started a positive dialog. If he offers me work I'd like to take it, and work non-business hours (~8hrs/wk, nights and weekends.)
How should I handle this with my full-time boss? Should I tell him? Not tell him? What's the generally accepted behavior in this situation?
P.S. I did a quick search and didn't find a pre-existing question about this, but if you know of one, by all means point me there.
EDIT: To clarify, I don't plan on hiding this from my boss if he asks. I'm wondering if it's considered rude to not inform him that I'm taking on additional work.