It depends on how much of the top layer of resin you've taken off with the scratches and the 1200 W&D really. If there's a thick enough layer left you have a fighting chance of getting a glossy finish again, if you've gone through to the weave you wont polish it no matter what - it would need re-coating. Not really viable.
If you havent gone through, you can spend an age with T-Cut or another cutting agent and elbow grease and you will get a semi-gloss finish, but it will never look as good as it did. Or you can find someone with a industrial buffer and get them to polish it - this works well but you need a decent enough layer of resin there in the first place.
You could pop into a friendly car sprayshop and ask nicely if someone will 2-pack clear laquer it for you. This would also solve the problem if youve sanded through to the weave as it will give you a half-decent gloss surface again. But again it will never be as good as new.
As for re-gel coating the chassis, i wouldnt even think about it !
And anything you can spray out of a can will last about 30 seconds on the track before it scratches off and looks worse than it did before you started.... Only good for shelf queens.
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