Poster are not considered Premium Prints or Reproductions, therefore they probably are not fade resistant or waterproof. The following steps may improve their lifespan, but in general Posters are not designed to last a long time.
Prints on canvas, watercolor paper and archival matte/gloss papers are
considered premium materials for the purposes of the following discussion.
Premium materials have been used to deliver you high quality image print or
reproduction. In general further steps such as lacquers may or may not have been
applied make your print or
reproduction more water and fade resistant.
That said, whether your print or reproduction is on paper or canvas, OR whether
in a glossy or matte finish, as with traditional photos, proper care will
maximize display life.
For indoor display, AKAJakePrints.com recommends that prints or reproductions be framed under glass or in a protective plastic sleeve to protect the prints from atmospheric contaminants like humidity, cigarette smoke, and high levels of ozone. DO NOT place glass or plastic directly on the print, instead use some sort of archival standoff such as an acid free mat or framer's felt to separate the surface of the print from the surface of the glass or plastic.
Although your print or reproduction may have been coated with a UV inhibitor, as with all photographs, the prints should be kept out of direct sunlight.
Gloss images should be handled carefully to prevent finger prints from adhering to the surface degrading the overall appearance of your print or reproduction.
Like photographs the image of your print exists as a very thin surface on the paper or canvas on which it is printed. Care should be taken to make sure your matte prints or reproductions do not get scratched or otherwise abraded.
These care instructions do not provide a guarantee or warrantee implied or otherwise, they are merely provided for informational purposes.