Not to burst your bubble, but if I were you I would take that thing back and tell Mr Siegel you want your money back. You can make a rack that size new, with tubs and heat for nearly what you paid new. Maybe he charged more for the stench? looks like the boards are severely sagging also.
If that's made out of melamine you won't be able to stain it.
Siegel has a questionable reputation and I see why.