Some papers produce much worse outgassing problems than others. I've done a moderate amount of experimentation with various papers (several years ago) iwth my 2200 and found that Epson glossy & semi-gloss papers were about the worst for outgassing. I typically wait an hour for the ink to dry, then put plain paper on it for about a week, then frame it, but there's still significant outgassing (despite Epson's claim that this prevents it, it doesn't - they're in a state of denial). Many third-party papers have much less severe outgassing than Epson's, however. I ended up choosing Ilford Galerie Smooth Gloss, which still has a little bit of outgassing, but not enough to be a problem (and less than other papers I tested), and much less than Epson's. (They also make a Smooth Pearl paper which is probably similar outgassing-wise.)
Lisa