Is Tru Oil readily available in Brazil, or do you have to import it?

If supply of Tru Oil is difficult, you could look for wipe-on polyurethane which may be easier to source. It will give a very similar result and the application is virtually the same as well.

Also, whilst I've never used it, there are water based polyurethanes that maybe more conducive to working inside a house or apartment as they don't have a turpentine component which has higher VOC level.