Friday, January 22, 2010
as yet unbaptized....
I got a response to the question of UV protective qualities of the Golden matte medium I am using on the mummies. Summed up - NO.. but Scott sent a raft of useful links and information:
Most acrylic mediums do not offer any UV filtering, as this requires special chemical additives. Both of our conservation grade varnishes do have UV filtering compounds in them, and one medium, Gel Topcoat with UVLS.
Gel Top Coat with UVLS:
Our regular Matte Medium does not offer UV filtering.
Some of the confusion that arises in this regard, has to do with the fact that all acrylics are naturally UV resistant. This is sometimes touted as one of the attributes of acrylic, and is then sometimes confused with UV filtering capabilities. UV resistant means that the acrylic molecules are resistant to UV light and the various types of damage that UV light can have on many different materials. This is one of the main reasons that acrylic is used in so many coatings today, including most house paints.
Acrylic mediums can certainly hold fibers together, and can add a different surface. They can add a bit of water resistance, especially glossy sheened products, however, all fine art grade acrylic paints dry to films that are porous to water vapor and air, so they will not work to completely seal a material from moisture. In this regard, they may help to add a longer life to some materials, but they will not necessarily stop other factors from causing various forms of degradation. Oxygen is a major cause of some kinds of damage to materials, as are acids that might already be in the material. Things such as cardboard or newsprint will yellow and become brittle over time due to acids in the fibers. An acrylic medium will not stop this from happening.
Here are some links with more general information about acrylic, along with technical information about our varnishes, which may or may not be suitable for your fiber pieces:
Golden Acrylics on Fabrics:
Aspects of Longevity of Oil and Acrylic Artist Paints
Will it Last?
Dont Fade Away article about msa uv testing on inkjet prints
Here is the varnish application literature :
Here are the individual varnish product tech sheets:
Creating a Brushable Isolation Coat - youtube video:
Brush Application of an Isolation Coat - YouTube video:
If you have any further questions, or need additional information, please do not hesitate to contact us.
Golden Artist Colors, Inc.