Digital BW, The Print

Hello. I know that for the best print longevity when using a dye based 
ink printer (in my case an HP 9800) it is advised to use HP's swellable 
paper. HP does not seem to have a true matte photo paper such as Epson 
Enhanced Matte paper. I have recently tried this paper and really like 
the look (B&W) with my printer. The question I have is, if I print on 
EEM or any non-swellable paper and use a protective spray on the 
prints, such as Preserve It, will this substantially increase the life 
of the print? Thank you for any responses.

Francis