Three main types used in boat building: Polyester resin is reinforced with glass fibres (Resinglass). An amateur can use polyester resin for repairs and odd jobs – just buy it and follow the instructions diligently. Epoxy resin is a first-class adhesive also available for DIY-ers, and no boat should be without a supply on board. Epoxy resin also forms the basis of good paints and surface treatments, as does Polyurethane, another synthetic resin.