Fibreglass Moulds

The aim of a fibreglass mould is to make the surface of the mould as smooth as possible, here at MPM we pride ourselves on the quality of every mould

CNC Machining

CNC machines can create parts out of a wide range of materials including wood, metal, foam and high or low density model boards, making the process extremely fast, accurate and beneficial to many projects.
We can work with a client's own design or offer a bespoke design service if required.

Hand Lamination

MPM offer high quality products in either high or low volume. Our flexibility and skill allow a wide complexity of projects, from bath panels, shower trays, ambulance parts, wheel chair access ramps, water tanks and many other products.

Resin Transfer Moulding

Resin Transfer Moulding/Closed Moulding is a cleaner and a more efficient and effective way of producing a composite part. Here at MPM we can provide a full complete service right through from the drawing concept to designing, producing and commissioning closed mould tooling.

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Fibreglass Moulds

Fibreglass moulds can be a one piece mould or, if the object has a complicated shape, made in two or more separate pieces bolted together to make the final mould that makes removal of the final part from the mould possible. 

There is little flexibility in fibreglass moulds so things can get permanently stuck. The aim is to make the surface of the mould as smooth as possible. If the surface quality of the mould is like a mirror then the cast object will be the same. The extra care taken in making the mould will reap rewards when the final parts are produced later. Mould release agents or wax should always be applied to moulds before laying fibreglass gel coat and matting. The following steps are a general guide to making a fibreglass mould.

How do you create a fibreglass mould?

  1. First, a plug is developed be the exact shape and dimensions of the required fibreglass mould.
  2. If the plug was made from a material that has open pours, such as wood, it would need to be sprayed with a material to create a good surface finish to mould from.
  3. Once this is completed, the plug should have a good all round surface finish.
  4. After this, the plug has to be coated with multiple layers of mould release. After each coat of release, the plug is buffed to keep a good surface finish.
  5. Once the plug is fully released it is ready for the application of gel coat.
  6. Next, apply the gel coat to the plug and leave to harden.
  7. Once the gel coat has hardened completely a skin coat is applied. This will be about 1 oz. of fiberglass chopped strand mat that is thin enough to remove all the air pockets.
  8. A specialist tooling resin system is then used to build up layers of fibreglass, removing all air pockets as these are applied.  The mould is then left to cure.
  9. Once the final layer has been applied and left to dry for a few days, the fibreglass mould is removed. Any excess resin or fiberglass excess is cut off and the final mould is sanded gently. 
  10. Finally, the mould is rubbed up and polished to create the required surface finish.

What are the benefits of fibreglass moulds?

The benefits of fibreglass moulds can be seen below:

More information on fibreglass moulding

For more information relating to fibreglass moulding and what MPM can offer you, please contact us on
Leeds +44(0) 113 236 0396 or complete our enquiry form.