How to repair a GRP hull using WEST SYSTEM® epoxy. Part 1

David Johnson demonstrates how to use WEST SYSTEM epoxy to repair a damaged GRP hull. In part 1 of 3, see how to cut out the damage and conduct a ‘letterbox repair’.
Watch the other videos in this series:
Part 2: • How to repair a GRP hu...
Part 3: • How to repair a GRP hu...
Watch other WSI videos about fibreglass boat repair
Fibreglass boat repair: how to assess the damage: • Fibreglass boat repair...
How to repair a bow using WEST SYSTEM epoxy:
Part 1: • How to repair a bow us...
Part 2: • How to repair a bow us...
For more information or support please visit our websites or contact us.
www.westsysteminternational.co...
www.epoxycraft.com
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[@boxer75010]

I learned a lot from this video. Thanks David Johnson! Brilliant teaching skills.

[@adrianp7475]

by far the best !!!

[@MegaExplorer69]

Very good demonstration. Looking forward to other videos.

[@alexmarchant1825]

Excellent videos and explanations. Thanks for sharing!

[@pedrsverge]

best explanation ever good teacher.

[@russellesimonetta3835]

Great information and skills at application.

[@azoresmarine]

Outstanding instructions. Thank you

[@harrismagnum04]

great vid but should you not alternate the fibre direction ?

[@WessexResinsandAdhesives]

Thank you for your very valid comment. However on a small vessel such as this we believe it is appropriate to have the biaxial fibres running at ±45° to the waterline to address the loading to the hull structure. On a larger more complex structure it may be fitting to have the fibres orientated to address all 4 axes. On such larger, complex structures it is recommended for an engineer to specify the exact fibre type and orientation in order to maintain the structural loading characteristics of the hull.

[@3rd_Millennium_Engineering]

What is the cure time for this epoxy?

[@WessexResinsandAdhesives]

Hi Ralph, WEST SYSTEM 105 Epoxy has 4 hardeners available. Offering different cure speeds. Details can be found here wessexresins.co.uk/west-system/find-the-right-product/hardener-filler-and-additive-selection-guides/ In this video, we used WEST SYSTEM 205 Fast Hardener which provides a pot life of 10-15min, a working time in thin film of 60-70min and a cure to solid state in thin film of 5-7 hours.