Hello all. :Welcome:
I have used the transparent (acetate?) sheets before, they appear
coated with some transparent inkjet-receptive compound.
I print on them with my Epson Stylus Photo (pigment ink?) and even
then they are nowhere as 'bright' as printing on a white surface.
Have tried waterproofing them with Clear Acrylic spray sealer and
also laminating type materials... but eventually water will still seep
underneath and ruin your print. They will never be waterproof/permanent.
Weirder still is... for the prints that I have done and kept in dark dry place,
the ink has spread (bloomed?) under the sealer... makes it look real wierd.
Nowhere near 'pro' quality by any overactive imagination.
Methink I need a printer that can do white ink on raw vinyl...