Digital BW, The Print

Has anyone had experience of 

<<MIS Gloss Coat Sample - Gloss Coat is a clear odorless coating 
which can be applied to a glossy archival pigmented print to 
eliminate dull spots and to seal the surface to make the print more 
durable. Requires a second printer to apply. Comes in a 2 oz sample 
bottle, virgin empty cartridge not included>>

from http://www.inksupply.com/index.cfm?source=html/accessory.html - 
I have an otherwise redundant Epson EX?

My apologies if this has been raised before, in which case a link 
would be appreciated.

Thanks,  

Colin