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R&G Polyester Resins (UP) Selection Guide

The resins described below are unsaturated polyesters (UP) dissolved in styrene. They are used for the production of fibre-reinforced plastics (GRP) or as casting resin.
Suitable reinforcing fibres are mainly glass mats and glass fabrics.

Laminating resin

UP Laminating Resin SYNOLITE 5690-P-1

Approved for boat building.
Cobalt pre-accelerated, environmentally friendly polyester laminating resin based on orthophthalic acid.
Greatly reduced styrene evaporation for boats, containers, automotive components, ponds and moulds. Slightly thixotropic, therefore no run-off from vertical laminates.

Processing time
with 2% MEKP hardener: approx. 20 minutes

Gelcoats

UP Pre-gel white

White gelcoat/covercoat resin for epoxy resin laminates.
Thixotropic (non-running), tack-free curing polyester topcoat resin for white topcoats in combination with epoxy resin laminates.

Processing time at 2 % MEKP: approx. 15-20 minutes
Consumption (with a layer thickness of approx. 0.4 mm): approx. 0.5 kg/m²

Processing information

Processing of Up Pre-gel

(in german language only)

Processing of UP-Resins

(in german language only) 

General information on unsaturated polyester resins

Unsaturated polyester resins 

(in german language only)