Polyester resin, sometimes referred to as unsaturated polyester resin or more simply polyester is a type of adhesive paste, filler and laminating resin. The resin normally comes as a pale, viscous solution or paste containing a polyester solution, normally styrene.
Polyester resins can be used to fill and join seals in metal, wood, hardboard, asbestos, concrete and plaster among many other materials. They dont need pressure to form a bond, and can also be referred to a contact resins. Polyester resins are commonly used in marine environments such as workboats, dinghies and yachts, as they office resistance to weather, water and some chemicals.
Some polyester resins require a hardener to set, while others can set on their own. Polyester resins tend to have a fixed storage life as some may set on their own during storage.
Generally cures and sets faster than epoxy resin.
Polyester resins are lower cost resins, and can be more suitable for hobbies.