Ella Walter
Fiberglass seat pans are a good option for DIY enthusiasts as they are easy to work with and can be customised to fit a bike perfectly. The thickness of a fiberglass seat pan depends on the shape and style of the seat, the number of layers of fiberglass matting used, and the type of matting used. The number of layers of matting used can vary depending on the desired thickness and strength of the seat pan. For example, woven matting is more flexible but requires more layers, while chop strand matting conforms better to shapes and may require fewer layers.
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What You'll Learn
The shape of the seat pan
When determining the shape of the seat pan, it is crucial to consider how it will be mounted to the sub-frame or bike. The mounting method may vary depending on the type of bike, so it is essential to plan this in advance. Some common mounting options include using bolts, suction cups, or welding tabs to the frame. If bolts are used, it is recommended to add penny washers and mould an extra layer of fibreglass over them for added strength.
It is also important to consider the shape of the rear fender when designing the seat pan. The seat pan can be shaped to match the contours of the rear fender, ensuring a seamless and integrated look. However, it is important not to get too creative with the shape, as complex designs can be challenging to work with and may affect the overall comfort and functionality of the seat.
Additionally, the shape of the seat pan should allow for easy removal and installation. This is particularly important if there are electronics or other components underneath the seat that may require access. A hinge setup or a cable pull mechanism can be incorporated into the design to facilitate easy removal and installation of the seat pan.
Overall, when determining the shape of a fibreglass seat pan, it is crucial to strike a balance between aesthetics and functionality. While it is tempting to get creative with the shape, keeping it simple and smooth will make the construction process easier and ensure a comfortable and secure riding experience.
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How to attach it to the frame
The thickness of a fibreglass seat pan is not standard and depends on the shape of the seat and the bike it will be attached to.
How to attach a fibreglass seat pan to the frame:
Before you begin, it is important to figure out the shape of the seat pan and how it will sit on your bike's sub-frame. The shape of the seat pan should be simple, smooth, or pointed. Abstract shapes are more difficult to work with and can affect the comfort of the final seat.
The method of attaching the seat pan depends on the type of bike you have. Some bikes can use a tongue at the front that hooks into the frame. Another option is to weld tabs to the frame and bolt the seat pan to it. You can also use a couple of bolts glassed into the pan or a suction cup at the rear.
If you are mounting the seat pan at the front using through bolts, add penny washers and mould an extra layer of fibreglass over them. Bonding in a plate with nuts welded to it is also a secure option, as it will spread the load on the fibreglass and reduce the chance of cracking.
If you want to be able to remove the seat pan easily, consider a hinge setup or a cable pull mechanism that unlocks the seat pan.
When attaching the seat pan, always work in a well-ventilated area and in the shade. Wear safety gear, including gloves, a face mask, and eye protection.
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The materials needed
- Safety equipment: Gloves, a face mask, and eye protection are essential to protect yourself from the resin and other materials.
- Wax: Use mould release wax, car wax, or bowling alley wax to make it easier to remove the seat pan after it's fibreglassed.
- Fibreglass mat: You'll need enough fibreglass mat to cover the entire seat pan. It's recommended to use small pieces about 5" square, or rip the fibre into chunks and place them on the pan area for strength.
- Resin and hardener: Use polyester fibreglass resin and hardener, mixing it according to the directions and the weather. Only use enough resin to soak the fibreglass mat; more resin does not make the pan stronger.
- Brushes: You'll need a couple of cheap 2" brushes to apply the resin and push out excess resin and air bubbles.
- Roving or cloth: A layer of roving or cloth adds extra strength to the seat pan. You can also use fleece.
- Duct tape: Use duct tape to cover the entire area for the new seat pan. The duct tape will act as a tray to form your desired shape.
- Cardboard: Cardboard can be used to create a cut-out shape for the electrics tray.
- Mounting hardware: Depending on your bike, you may need bolts, nuts, washers, and other hardware to mount the seat pan to the sub-frame.
- Foam: You'll need about 2 inches of foam for the bottom of the seat to provide back support.
- Sandpaper: Sandpaper can be used to finish the edges of the seat pan and shape the foam.
Remember to work in a well-ventilated area and always in the shade when working with these materials.
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The process of fibreglassing
The manufacturing process for fibreglass involves transforming raw materials into a versatile and lightweight final product. This process is known as pultrusion and involves the following steps:
Melting
The raw materials, including silica sand, limestone, alumina, and other minerals, are melted in a furnace to create molten glass.
Extrusion
The molten glass is forced through tiny openings, forming continuous strands of fibreglass. This step is crucial for achieving the continuous fibres that characterise fibreglass.
Cooling and Sizing
The extruded fibres are rapidly cooled to solidify, and a sizing or coating is applied to enhance their adhesion to resin during the composite manufacturing process.
Formation of Mats, Rovings, Fabric, and Tape
The continuous fibres are processed into different forms, such as Chopped Strand Mats, Spray Up Roving (Chopper Gun), or Woven Fabric. Chopped Strand Mats provide uniform strength and facilitate resin distribution, while Woven Fabric offers enhanced strength and dimensional stability for applications like aerospace components.
Impregnating the Fibres
The preformed filament rovings or mats are then saturated in a resin bath, which impregnates the glass fibres with the required performance properties. The resin composition will vary depending on the specific project.
Casting and Setting
The impregnated glass fibres are pulled through a heated pool and cast into the desired moulds, where they set and cure. This process results in a fully polymerized fibreglass product that is strong and lightweight.
When creating a fibreglass seat pan, there are a few additional considerations and steps to follow:
Planning and Preparation
Determine the desired shape of the seat and how it will mount to the sub-frame. Trim the backrest area to allow for added foam cushioning. Ensure you work in a well-ventilated area and always in the shade.
Materials
Gather the necessary materials, including polyester fibreglass resin and hardener, fibreglass mat, fibreglass roving or cloth, cheap brushes, and mould release wax.
Application
Start by applying a layer of resin to the sub-frame using a brush. Then, lay down the first layer of fibreglass mat, using only enough resin to soak the fibreglass. Use the brush to remove air bubbles and excess resin, ensuring an even application.
Strengthening and Drying
Add a layer of roving or cloth (fleece can also be used) for extra strength. Allow the fibreglass to dry overnight.
Trimming and Finishing
Once dry, carefully remove the fibreglass from the sub-frame and mark the trimming areas with a marker. Trim the fibreglass to the desired shape and smooth the edges. Finally, attach the fibreglass seat pan to the frame using bolts, washers, or other suitable methods.
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Trimming and finishing
Before beginning the trimming process, it is essential to plan the desired shape of your seat pan. Determine whether you want a simple design or something more abstract. Keep in mind that smoother shapes or pointed edges are easier to work with, while abstract shapes can be more challenging to cushion flawlessly. Consider how the seat pan will sit on your sub-frame and whether you need to allow for back support by trimming the backrest area slightly higher.
Now, let's move on to the trimming process. After your fibreglass resin has cured for 1-3 hours, it's time to remove the seat pan from the bike or bench. Carefully take off all the tape and support materials, such as sheet metal and cardboard. Put on your safety gear, including gloves, a face mask, and eye protection, before handling any sharp tools or materials. Begin trimming the rough edges of the seat pan little by little, using appropriate tools like a finisher or sandpaper to achieve the desired shape. Take your time with this step to ensure a precise finish.
Once you are satisfied with the basic shape, it's important to finish the edges smoothly. Sand the edges with sandpaper to create a uniform and comfortable surface. After sanding, you should be able to place the seat pan on the bike and adjust it perfectly. It will align with the tank style and frame angle, allowing for easy fixing and removal.
The next step is to add cushioning to your seat pan. Cut out some foam and shape it to fit your seat pan securely. Utilise contact adhesive and a rasp file to attach the foam securely. This step will ensure a comfortable riding experience.
Finally, consider the overall aesthetics of your seat pan. You can glue additional pieces to the seat pan and trim them back to achieve the desired look. This step allows you to add personal touches and ensure the seat pan aligns with your vision. Remember to always work in a well-ventilated area and take your time throughout the entire process.
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Frequently asked questions
I could not find a definitive answer for how thick a fibreglass seat pan should be. However, I did find that the thickness of the pan can be adjusted by adding multiple layers of fibreglass matting.
The number of layers of fibreglass matting you use is up to you, as it depends on the desired thickness of your seat pan. However, it is important to note that more layers do not necessarily make the pan stronger.
To make a fibreglass seat pan, you will need fibreglass resin and hardener, fibreglass matting, duct tape, paintbrushes, a tray, and clay (optional). You will also need safety equipment, including gloves, a face mask, and eye protection.
There are several ways to attach a fibreglass seat pan to a frame. One method is to drill screws directly into the fibreglass and bolt it to the frame. Another method is to weld tabs to the frame and use bolts to secure the pan. It is important to consider the strength of the attachment method, as well as the ease of removal.
To shape a fibreglass seat pan, you can use duct tape to create a tray that will form your desired shape. You can also use cardboard to cut out the shape and tape it in place before applying the fibreglass. It is recommended to keep the shape simple and smooth for the best results.
