I have a bare frame that I just got back from the sandblasters.I have a few more weeks of work before it will be ready for paint.What can I do to protect the metal.Will it be fine if its in my garage ,or do I need to spray it with a primer now since its bare?

I am going to start boxing the frame ,and would like to paint the inside of it before I box it.Will spray cans work for this?Thanks