Dave I can't believe it took me 15 minutes to respond LOL
I agree with Dave somewhat. However, oils will adhere to glass. Under good conditions will hold up for centuries.
Now with the Mylar in about 1980 a group of watercolour artists came up with the idea of painting on frosted mylar. I can verify that it does work. I framed a bunch between 1980 and 1984. I used linco corners to attach them. I have several hanging at home. Most are faded now. I have watercolors by the same artists on rag papers hanging next to them which are fine. Not sure if this proves anything. Except creativity in the use of unknown materials is at best iffy. Good today scrap in a decade or two.
From reading some of the replies I think some don't really know the structure of mylar.
Here is some info. the rest can be obtained by doing a little research..
Water base adhesives will probably not be a good solution.
Mylar
Manufacture and properties
Chemical structure of polyethylene terephthalate
The manufacturing process begins with a film of molten polyethylene terephthalate (PET) being extruded onto a chill roll, which quenches it into the amorphous state.[2] It is then biaxially oriented by drawing. The most common way of doing this is the sequential process, in which the film is first drawn in the machine direction using heated rollers and subsequently drawn in the transverse direction, i.e. orthogonally to the direction of travel, in a heated oven. It is also possible to draw the film in both directions simultaneously, although the equipment required for this is somewhat more elaborate. Draw ratios are typically around 3 to 4 in each direction.
Once the drawing is completed, the film is "heat set" or crystallized under tension in the oven at temperatures typically above 200 °C (392 °F). The heat setting step prevents the film from shrinking back to its original unstretched shape and locks in the molecular orientation in the film plane. The orientation of the polymer chains is responsible for the high strength and stiffness of biaxially oriented PET film, which has a typical Young's modulus of about 4 GPa. Another important consequence of the molecular orientation is that it induces the formation of many crystal nuclei. The crystallites that grow rapidly reach the boundary of the neighboring crystallite and remain smaller than the wavelength of visible light. As a result, biaxially oriented PET film has excellent clarity, despite its semicrystalline structure.
If it were produced without any additives, the surface of the film would be so smooth that layers would adhere strongly to one another when the film is wound up, similar to the sticking of clean glass plates when stacked. To make handling possible, microscopic inert inorganic particles are usually embedded in the PET to roughen the surface of the film.
Biaxially oriented PET film can be metallized by vapor deposition of a thin film of evaporated aluminium, gold, or other metal onto it. The result is much less permeable to gases (important in food packaging) and reflects up to 99% of light, including much of the infrared spectrum. For some applications like food packaging, the aluminized boPET film can be laminated with a layer of polyethylene, which provides sealability and improves puncture resistance. The polyethylene side of such a laminate appears dull and the PET side shiny.
Other coatings, such as conductive indium tin oxide (ITO), can be applied to boPET film by sputter deposition.
Applications
Uses for boPET polyester films include, but are not limited to:
Flexible packaging and food contact applications[edit source | editbeta]Laminates containing metallized boPET foil (In technical language called printin or laminate web substrate) protect food against oxidation and aroma loss, achieving long shelf life. Examples are coffee "foil" packaging and pouches for convenience foods.
White boPET web substrate is used as lidding for dairy goods such as yogurt.
Clear boPET web substrate is used as lidding for fresh or frozen ready meals. Due to its excellent heat resistance, it can remain on the package during microwave or oven heating.
Roasting bags
Metallised films
Laminated sheet metal (aluminum or steel) used in the manufacture of cans (bisphenol A-free alternative to lacquers)
Covering over paper
A clear overlay on a map, on which notations, additional data, or copied data, can be drawn without damaging the map
Metallized boPET is used as a mirror-like decorative surface on some book covers, T-shirts, and other flexible cloths.
Protective covering over buttons/pins/badges
The glossy top layer of a Polaroid SX-70 photographic print
As a backing for very fine sandpaper
boPET film is used in bagging comic books, in order to best protect them during storage from environmental conditions (moisture, heat, and cold) that would otherwise cause paper to slowly deteriorate over time. This material is used for archival quality storage of documents by the Library of Congress and several major library comic book research collections, including the Comic Art Collection at Michigan State University. While boPET is widely (and effectively) used in this archival sense, it is not immune to the effects of fire and heat and could potentially melt, depending on the intensity of the heat source, causing further damage to the encased item.
For protecting the spine of important documents, such as medical records.
I would like advice as to how to archivally mount mylar; recommendations on which mounting board and how to attach art to the mounting board.
Knowing what I know about boPET polyester films.
I would test an adhesive that sticks to polyester. Micro dot in just a couple places along the top edge only. Use a Rag Foam core with a Coroplast backing.
Micro dots of adhesive may not be removable but the rag foamcore could be scrapped of easily.
My recommendations.....
Frame then anti static Plexi then Liner then art then rag board then corplast then backing paper then wallbuddies.
After I have informed the Artist how it should be done and why.
Keeping in mind the Artist always has the right to tell me ho he wants it handled.....
Also glass is at least rigid.
