Hello Heather,
I am the C2CC monitor this week. I am an objects conservator, and while 3D glass it one of my specialties, stained glass is its own subspecialty. I do know that protecting the exterior sides of stained glass panels with sheets of polycarbonate, plexiglass, or glass is a common practice to protect stained glass from the natural elements when it is installed in a historic building (most often churches). What you're describing is a very different scenario, as this would be placing the protective layer in front of the stained glass on the viewing side. While it would certainly act as an effective barrier for curious little hands, the reflective surface may be quite visually detracting. Furthermore, there are more general concerns with protective glazing about creating a microclimate in the gap between the stained glass and the protective glass that can cause condition issues (e.g. the formation of condensation can accelerate deterioration mechanisms). Could you give a little more detail about the installation parameters? Is this in a high-traffic location? My first thought is that perhaps a less costly intervention, such as a small stanchion or high traction tape on the floor, could help minimize patron interaction. I can certainly reach out to a stained glass specialist for additional / more detailed insight on considerations for installing a protective glazing layer.
Best,
Rebecca
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Rebecca Gridley
Partner
Art Conservation Group LLC
Long Island City, NY
rebecca.ec.gridley@gmail.com------------------------------