Gelcoat is a material used to provide a high-quality finish on the visible surface of a fiber-reinforced composite. The most common gelcoats are thermosetting polymers based on epoxy or unsaturated polyester resin chemistry.

Gelcoat resin coated surface is glossy after cured. It has good mechanical properties and water resistance and is resistance to mild chemicals and ultra-violet light, thus enhancing the durability of glassfibre reinforced plastics (GRP) products.

Polyester gel coats are a polyester resin that are commonly used as a surface coating in the composites industry. The strengths of polyester gel coat include:

• Durability: Gel coats are extremely durable and resistant to UV light and weathering, which makes them suitable for outdoor applications.
• Chemical resistance: Gel coats have good resistance to a wide range of chemicals, including acids, alkalis, and solvents.
• Aesthetics: Gel coats can be pigmented to create a wide range of colors and finishes, and they can be polished to a high gloss.
• Good mechanical properties: Gel coats have good impact resistance, which makes them suitable for applications where the surface may be subject to impacts.
• Easy to apply: Gel coats are easy to apply and can be sprayed, brushed, or rolled on the surface.
• Cost-effective: Polyester gel coats are relatively inexpensive compared to other coating options, making them an affordable option for many applications.
• Versatile: Polyester gel coats can be used in different types of composite products such as boats, tanks, pipes, and other structures, solid surface materials, laminates, and many other applications
• Good adhesion: Gel coats have good adhesion to the substrate, which helps to keep the composite structure together.