TOPCOAT

   Topcoat is a surface-applied coating that provides composite structures with a smooth, protective, and UV-resistant finish. Topcoat contains added paraffin, which makes it suitable as a surface paint. Gelcoat, on the other hand, is applied against the mold before laminating. Topcoat is especially used to protect the outer surfaces of laminates and in repair work where a durable and clean finish is desired..

Read more about polyester.