Any form of Lamination should keep the outgassing away from the glass.
All my work is either ultrachrom 7600 or 7800 (K3), and the paper mainly luster or P Glossy. both outgass terribly depending on the image involved.
The work I have laminated will not show the effect, however lamination on a large print IMO has it's own disadvantages, mainly in creating a ripple or orange peel look. I am sure this is very dependent on the process used. You have to get right up on the print to see the effect, I don't use that often due to my added costs.
Many have reported the used of heat on the prints, followed by pressing between paper, like newprint. In fact a person who had been to one of th Epson classes on the 7800/9800 said that this was one of the methods Epson recommended. Basically they said either use a mat paper or expect outgassing.
I guess that most people don't use Epson paper"s on these printers as to me this is a really big problem and most people don't seem to worry about it. I don't work that much with mat paper instead preferring the look of luster and Luster has this problem in spades. I don't think the 7800 is any worse than the 7600, but it's also do better.
I have also read that Plexiglass will not have this same problem with outgassing I guess because it wil allow the gasses to pass through and glass will not.