I've got this mountain bike, it's probably about 12 years old now, and it was sitting in the shed for years, in dry conditions. I recently decided to strip it down and I was going to respray it as it was rusted and peeling.
The thing is, I don't know what kind of metal the frame is made of, but it seems to be a total and absolute rust magnet. The paint had totally peeled off of a lot of it, and there was rust everywhere underneath about 60% of the frame. I used paint remover to remove the rest of the paint, and the next day all these "clean" parts had rusted as well!
I went at it again with wire brushes and sandpaper, and got most of the rust off, and came back the next day and it was rusted again! It seems to be (I'm assuming) rusted inside the frame too, there's, like little (air?) holes in several parts of the frame.
So, basically I'm wondering if it's even worth the bother to clean and respray it, will it just rust again?
Is it just some kind of cheap junk metal\frame? Should I just prime and spray it anyway, or will it just rust again in a few months, and all the paint fall off again?
The rest of the parts, while some were rusted initially, cleaned up just fine, and they've been sitting for a few weeks now with no signs of rusting again. So it's just the frame that's the problem.
Here's some photos.
I was using paint remover to remove the paint a few weeks ago, and about 50% the paint just fell off where it was rusted underneath, and the rest of it was really stuck on there. Everything that's not rust is the leftover grey paint. I was going to start priming it at this stage, and so I went at it with a wire brush and sandpaper last week and I had just about all the rust removed.
Then I was busy for a few days, and it was sitting in the kitchen, and I came back and it was like this. The rust on it is like a layer of dust and particles, that almost rub off on your hand if you touch it.
The second image is one of the holes in the frame. It's like the manufacturers put them there on purpose, but I don't know the reason. I can hear "stuff" in there if I shake the frame, I thought it might be sand if it was sandblasted..