In a few cases, a re-putty and repair is all that is needed for stained glass windows. In this process, the original lead is not replaced. Information on the Stained Glass Restoration process is available here.
The following describes Classic Glass Ltd.'s stained glass re-putty and repair process:
Document existing installation of stained glass windows and surround.
Label all stained glass panels and openings.
Remove stained glass panels from exterior of framework.
Assess stability, and stabilize the stained glass panels if necessary prior to removal.
Load stained glass windows on proper racks in enclosed truck for safe transportation to studio.
Install weather tight wood temporary coverings over openings if necessary.
Once at studio, the stained glass windows will be assessed for condition.
Broken glass will be replaced, repaired or leaded, to be determined on a case-by-case basis.
Broken painted pieces will be re-painted or leaded, to be determined on a case-by-case basis.
Stained glass windows will be puttied/cemented on both sides as per the specifications with a mixture of linseed oil, calcium carbonate, and blacking.
Some oxidation will be removed at this point, but removal of all cannot be guaranteed.
Apply flat steel re-bar to back (outside) of the stained glass panels where necessary.
Polish and clean stained glass windows.
Load stained glass windows on proper racks in enclosed truck for safe transportation to job site.
Re-install stained glass panels into new frames utilizing scaffolding or lift equipment.
Please keep in mind this process does not include re-leading as the original lead is not replaced.
The process is based on the Stained Glass Association of America standards and guidelines for restoration of stained glass windows.