What is the best temporary rust protection I can give my car before I can take it to a professional paint shop?

I'm asking this because I found a few minor rust spots on my car that I want to stop before doing anymore damage. I've heard all kind of "quick-fix" solutions from spraying burnt engine oil in wheelarches and boonet hinges housing to boiled vaseline and I wonder which would be the best solution for 1-2 months?