Protecting surface that has small surface rust already?

it has to breath... it will have moisture inside it, if it sits in the sun, it will condense inside the 'bag' :)
contact zip-loc, they should be able to help you out :wink:

oh, you can get a spray can of etching primer and some sand paper at like, wal-mart... not really, but its not too hard to find. make sure its etching primer. sand the rust off, put several (3-4) thin coats of primer on it (that way it doesnt load up the scratches or whatever and it covers better), then like cover the whole area of primer with like gloss spray paint, it will help seal it.