Polyester resin is a synthetic polymer material widely used in picture framing, artwork coatings, and other applications where a hard, durable, and glossy surface is desired. It is formed by the chemical reaction of polyesters with a cross-linking agent, typically a peroxide, which creates a rigid, thermoset plastic once cured. Polyester resin is valued for its strength, impact resistance, and ability to hold color or embed decorative elements.

Uses in Picture Framing

As a coating for decorative frame mouldings to achieve a glossy, finished appearance.
Embedding or encasing objects or artwork for display purposes.
Creating clear or tinted protective layers over prints, photographs, or three-dimensional pieces.
Used in combination with fiberglass or other reinforcement materials for increased durability.

Properties

High gloss and smooth finish when cured.
Strong and resistant to impact, scratches, and heat.
Lightweight compared to metals or glass, making it easier to handle in framing.
Non-archival in some formulations, as certain resins may yellow or emit VOCs over time.

Application

Applied in liquid form and then cured, often with heat or UV light depending on the formulation.
Can be sanded, polished, or painted after curing to achieve desired visual effects.
May require mold release agents if used in casting or moulding applications.

Advantages

Provides a durable and aesthetically pleasing finish.
Allows for embedding of objects for unique display effects.
Resistant to many physical impacts and environmental stressors.

Limitations

May not be suitable for long-term archival framing without proper UV protection.
Requires careful handling during application due to chemical fumes and curing requirements.

Polyester Resin