My contrator is replacing some old hotwater baseboard with radiators in my 1929 farmhouse. (Opens up the wall space for bookshelves). Any thoughts on new vs. used radiators? If you'd suggest used, should they be sandblasted (they'll be covered, so it doesn't make too much difference aesthetically).

Just for entertainment: my deal is that the contractor will install all new component, but he has installed some nasty looking used ones. I'm open minded though, since the old stuff is often much better than the new, esp. when it comes to this sort of thing. Any tests/questions to ask about the old ones?

What do you think TOH? Thanks.