What Paraloid B-72 Is
Paraloid B-72 is a thermoplastic acrylic copolymer resin manufactured by Dow Chemical. It is a colorless, transparent material that becomes sticky when dissolved in organic solvents like acetone or toluene. Conservators value it because it creates a protective layer that does not yellow over time like older adhesives do.
How It Is Used as an Adhesive
Conservator-restorers dissolve Paraloid B-72 in solvent to create a liquid adhesive. They apply this solution to broken edges of artifacts and press the pieces together. As the solvent evaporates, the resin hardens and bonds the pieces permanently. This method works well for ceramics, stone, glass, and wooden objects that need structural repair.
How It Is Used as a Protective Coating
When brushed or sprayed thinly onto the surface of artifacts, Paraloid B-72 creates a clear protective barrier that prevents dirt, dust, and moisture from damaging delicate surfaces. This is especially useful for paintings, frescoes, and porous stone. The coating is invisible and does not alter the appearance of the original object.
Consolidation of Fragile Materials
For very fragile or crumbling artifacts like ancient ceramics, stone, or pigmented surfaces, Paraloid B-72 can be applied to consolidate loose particles and strengthen weak areas. The resin soaks into the material and binds particles together, preventing further damage or loss of detail.
Advantages for Conservators
Paraloid B-72 is preferred because it is reversible, meaning it can be removed later with the right solvents if needed for future conservation work. It does not shrink significantly as it dries, does not become brittle, and is stable when exposed to light and temperature changes. These qualities make it reliable for long-term artifact preservation. 
Answer