The primary change was the entire west wall; its aged dry plywood panels were replaced with non-flammable translucent plastic (upper) and opaque aluminum (lower).
The coating had the following characteristics: it was non-toxic, non-flammable, and would dry smoothly on metals within half an hour of surface application.
Mono-ethylene, di-ethylene and propylene glycol are non-flammable petroleum products and similar products are most commonly found in automotive cooling systems.
