Digital BW, The Print

I'm currently printing with MIS-VM inks on EAM and Brightcube Semi Mate.
Looking to improve longevity,I read Robert Morrison's posting on the Krylon
UV Resistant Clear (#1305),which looks promising. Just that here in
Brazil,in all the shops I look at,I can\ufffdt find this exact Krylon (they only
have the coloured ones,doesn't look like a good idea...). They do have other
brands of protecting transparent sprays, acrilic based,in two kinds: Matte
and Glossy(or brilliant if you wish).
I was wondering if it would be a good idea to use the brilliant one to the
EAM and the matte version to BSM...does it make sense? Any experiences?
Thanks,
Andr\ufffd