Hi
Welcome to the forum
I am finding it difficult to believe that epoxy resin is not available ln your country, it is used for many applications. have you tried an ebay search.
Regarding the rails, try using scotchbrite pads or similar with a light oil or WD40
(depends how heavy the rust deposit is, if you search the forum there is some info regarding electolosis for cleaning profile rails.stop running the carriages along the rails for a start, it might be possible to get a half decent result with a bit of work.
Good luck
Regards
Mike