Digital BW, The Print

I have recently begun to research the various u/v protection sprays
that are available.  There seems to be a few on the
market...PrintShield, Glamour 2, Premier ECO and Clearstar Clearshield
that I have seen.  It seems that there are considerations such as the
type of paper used (gloss vs matt or semi-matt), the final appearance
of the print you are striving to achieve and maybe others I have not
thought of.  I print on an R2400 using a combination of Epson K3 and
MIS K4 carbon based LK, LLK and EZ-W inks on matt and semi-matt
papers.  Any comments would be appreciated.  I seems that the
water-based products are the best way to go?  

Jeff Burger