The Lascaux seems to be a thinner, less viscous spray with a solvent that does not evaporate as quickly. It may penetrate the paper better and lock up the innards of the ink receptor coating. Working from memory, I think I may have used it when I was experimenting with dyes on metallic paper because I didn't want to alter their look. (I no longer use dyes for any serious work. I think their longevity is exaggerated by the Wilhelm and other tests.) Also, the best longevity ratings I've heard of for inkjet prints may be those that used Lascaux spray first, and then the Print Shield later. I suspect that while the Lascaux penetrated the coating better, the Print Shield blocked the pores and laid a coating over the entire print.
Frankly, I now mostly just use Print Shield on glossy work that is not displayed under glass, and I use no spray on matte paper, which I always display under glass or acrylic. I believe all of the sprays decrease matte dmax, though Lascaux probably does so less than Print Shield.
I might add that there are lots of other sprays, but I found the nozzles of the two products mentioned above were better than the others I tried. That is, I was able to get a more even spray out of them.
Paul
On Wed, Jul 25, 2018 at 6:33 AM paulmwhiting@... [DigitalBlackandWhiteThePrint] <DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:
Paul,"For the glossy prints I dry mount them on acid free foam core and spray them with Premier Art Print Shield..."If memory serves, I saw in some cases you use Lascaux Fixativ... is the choice of spray a matter of glossy vs matte paper? Perhaps the Lascaux is better for matte paper? I thought I read somewhere that the Premier Art spray weakened the DMax somewhat.Paul W.