That frame is chrome plated.

Don't bother about any expensive commercial "frame saver" product. Just use a litre of engine oil inside the tubes, (pump it in with a dollar store turkey baster) swish around and let drain. Remove the seatpost and BB unit to get to the main tubes. There will be small holes in the ends of the stays and fork. What I use is auto rustproofing stuff that one of the rustproofing shops will sell you. If it's good enough for a 150k Porsche...................