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WPPaper will
degrade and come apart if continually exposed to direct sun light within
60 to 90 days. Because it is a plastic (petroleum product)
it dries out and begins to become brittle.
WPPaper is
very porous and some inks (Hansa yellows) will diffuse through
the film to the reverse side of the film. Some inkjet inks (typically
generic inks) will fully migrate through the film, while some
other ink formulations will not bond with the coatings and can
literally be shaken off the WPPaper.
WPPaper should
be covered when stored as the coatings will absorb impurities
in the air and discolor.
WPPaper left
in contact with any surface with free color particles will absorb
the particles. A piece of WPPaper placed in your wallet between
two banknotes will absorb the ink from the notes.
After WPPaper
is left underwater for several hours, the air pockets in the
film will absorb water and the WPPaper will become translucent.
If this occurs, you can blot the excess water from the film
and it will air-dry to its original opaque state.
WPPaper may
be overprinted (varnished) with oleoresinous (oil-based resin)
coatings to seal the absorptive properties of the film after
the desired image has been applied. This will provide good resistance
to coffee stains and discoloration from environmental impurities.
We have also had good success with spray-on fixatives.
WPPaper will
feed through most laser printers and copiers. Multiple feeds
are common if tray feeding is attempted unless the WPPaper is
adequately fanned immediately prior to printing.
WPPaper readily
accepts aqueous inkjet prints. The highly absorptive substrate
and coating accepts aqueous ink and sets quickly yielding excellent
results. Colors will be slightly lighter and less saturated
than those obtained on plain or photo-inkjet papers.
If both inkjet
and toner printing will be performed on the same sheet, the
inkjet image should be applied first as the fuser stage of laser
printers slightly modifies the top surface of weatherproof paper.
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