Sarah Nunberg felt that the ethics behind conservation of the chapel was central to deciding the proper conservation treatment, resulting in extensive discussions with paintings conservators Carolyn Tomkiewicz, and Soraya Alcala, and chemists Chris McGlinchy and Cindie Kehlet.
Three treatment options were discussed based on practices applied to other white Nevelson sculptures and our own observations of the Chapel of the Good Shepherd paint surface:
1: Remove all paint with a heat gun and scraping spatula, then prime and repaint the surface.
2: Consolidate all paint, then fill and tone losses, also toning out brown streaking, discoloration and dirt.
3: Consolidate all paint and clean off top layer of restoration, leaving the first restoration layer in tact. The original cream color would show through, along with a grayish thin paint application. Fill and tone losses and carry out any further toning necessary to cover distracting irregularities.
For all scenarios, environmental management is essential for long term preservation.
Option three was decided upon using a gel system to clean off the top restoration paint. The latest restoration paint responds readily to the chosen gel system. However, the earlier, more compact restoration layer and the original layer do not respond to the gel system.
Justification: Removal of all the paint was not favorable, as the process did not comply with the AIC code of ethics because the original paint layers were applied either under Nevelson's direct supervision or in part by Nevelson herself (see methods of manufacture page on this website). GIven the wooden substrate, application of a new paint layer would require substantial surface preparation, further altering the original surfaces and long term maintenance of the new restoration layer would need to be considered.
The ethics behind removing the restoration paint were discussed as well. It is likely that some of the restoration paint was applied during Nevelson's lifetime. Nevelson suggested reapplying white paint to keep her sculptures clean. The more compact restoration layer, closest to the original layer, may have been part of the original construction- did Nevelson apply this layer herself during installation to cover seams and touch up after assembly?
Preserving the current restoration surface seemed counterintuitive given the textured, discolored and streaked surface with brown staining, which is so different from Nevelson's original intent of a pure white space. Additionally, the interaction between the restoration paint and the original paint was found to be detrimental to the original paint. The brown streaking appears to be a result of this interaction and is mostly in the restoration paint, so reduction or removal of this layer would remove the disruptive brown streaking. Cleaning tests confirmed this.
The current solution to remove the dirty, streaked, textured, stained restoration paint, but leave the compact, smoother layer seemed to be a good compromise that could be accomplished using the gel system. The chosen system is water based so it is non-toxic to conservators and the environment, and the method of application and cleaning is the most efficient of all options explored.