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The tables below show the recommended resin to fibreglass ratios and catalyst ratios for polyester resin systems. These are general guidelines and may vary based on specific materials and applications. Always refer to the manufacturer's recommendations for the best results.

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Resin to Fibreglass Ratios

Material (Kevlar/Carbon Fibre?) Resin Per Sq Meter Thickness
300g (1oz) Chop Strand Mat 650g 0.5mm
450g (1oz) Chop Strand Mat 1.0 kg 0.75mm
600g (2oz) Chop Strand Mat 1.4 kg 1.0mm
900g (1oz) Chop Strand Mat 2.0 kg 1.5mm
125g Plain weave Glass cloth 150g 0.25mm
200g Plain weave Glass cloth 250g 0.5mm
300g Woven Roving 300g 0.25mm
600g Woven Roving 600g 0.5mm
800g Woven Roving 800g 0.75mm
600/300 Combination Matt 1.2 kg 0.75mm
800/450 Combination Matt 1.7 kg 1.0mm
600g Biaxial Glassfibre 700g 0.5mm
800g Biaxial Glassfibre 900g 0.75mm
Gel Coat 600g 0.5mm

Catalyst Ratios

Temperature 5°C to 13°C 13°C to 16°C 16°C to 20°C 20°C to 25°C
% Catalyst to Resin 4% 3% 2% 1%
Catalyst Amounts for
Common Resin Quantities
(Using the above % Catalyst to Resin)
100g 4ml 3ml 2ml 1ml
500g 20ml 15ml 10ml 5ml
1.0 kg 40ml 30ml 20ml 10ml
1.5 kg 60ml 45ml 30ml 15ml
2.0 kg 80ml 60ml 40ml 20ml
2.5 kg 100ml 75ml 50ml 25ml
3.0 kg 120ml 90ml 60ml 30ml
3.5 kg 140ml 105ml 70ml 35ml
4.0 kg 160ml 120ml 80ml 40ml
4.5 kg 180ml 135ml 90ml 45ml
5.0 kg 200ml 150ml 100ml 50ml