Gelcoat Fiberglass Mould Repair (how to) @MatthieuLibeert
Gelcoat Fiberglass Mould Repair (how to)  @MatthieuLibeert
Uploaded December 2021 | Updated September 2026, 1 week ago
Hi everyone!
Here's a quick video about repairing moulds.
This is a separate video out of a RTM mouldmaking series that will be uploaded later on!

The main reason I decided to make this video, is because mostly when you look online you'll only see good results. Now and then a mould can fail, and I'm not ashamed of it! It's part of the game, instead of being frustraded it gives you an opportunity to try out new things and be creative in some ways.

In this video I've used the uni-tool moulding system from @easycompositestv make sure to check their channel out for more content and have a look on their website easycomposites.co.uk for european customers, they now also have a .eu website.

Products used in this tutorial are the permagrit rotary cutting tool, tooling gelcoat, mouldcleaner, MW1 Wax, Mekp hardener, some brushes and miscellaneous products like tapes, brushes, acetone, mixing cups, ...

If you have mould with defects on the gelcoat side, best practice in my personal opinion is to sand down the area to repair, make so scoring marks with a dremel and a permagrit cutting tool. Then clean and degrease followed by mixing a small amount of gelcoat, mixed with MW1 wax and mekp hardener. Then apply in a generous way and sand back to flat state. After sanding you can polish everything and you're ready to go!

#easycomposites #mould #gelcoat
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Matthieu Libeert (Mats Prototyping) |

Gelcoat Fiberglass Mould Repair (how to)

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