Andrew Pace
When it comes to bolting seats into a fiberglass boat, there are a few methods you can use. One way is to use a nut and bolt, but if you can't access the other side of the fiberglass, you may need to use a coarse screw and drill it directly into the fiberglass. Another option is to use blind rivets, also known as pop rivets, which can be installed without access to both sides of the fastener hole. If you want to avoid drilling holes in the deck, you can try using blocks of wood to secure the seats. It's important to consider the load that the fastener will need to handle and choose an appropriate fastener. Additionally, if you're working with foam below the floor, you may need to create some clearance for the toggle.
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What You'll Learn
Drilling screws into fibreglass
To mitigate this issue, it is recommended to pre-drill holes in the fibreglass before driving in the screws. This helps to reduce the damage to the fibres and provides a better grip for the screws. When pre-drilling, it is generally advised to drill slightly larger holes to accommodate the screw threads. If the hole is too small, it can cause excessive stress on the screw and decrease its holding strength.
Additionally, consider using a sealant or adhesive, such as 3M 5200, to fill the pre-drilled holes before inserting the screws. This will not only enhance the grip of the screws but also create a waterproof barrier, preventing any potential water ingress.
Another technique to avoid breaking the fibreglass is to drill a hole the size of the screw shaft and then heat the screw with a lighter to soften the resin. Driving the screw into the heated resin will create a threaded hole without cracking the fibreglass. This method has proven effective for mounting boat accessories.
When choosing screws for fibreglass, it is recommended to use stainless steel sheet metal screws or machine screws. Tapered wood screws are not suitable as their taper can break the fibres, making it easier for the screw to back out. By following these guidelines and techniques, you can effectively drill screws into fibreglass when bolting seats in your fiberglass boat.
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Using bolts or machine screws
Bolts or machine screws are essential for securing components or hardware that are crucial to the function and safety of your boat. When bolting seats in a fibreglass boat, it is important to consider the type of fastener you will use.
Bolts require nuts and access to both sides of the fastener hole. Machine screws are similar to bolts but thread into a tapped hole. If you are unable to access the backside of the fibreglass, you may need to use a coarse screw and run it through the seat and into the fibreglass. This can be done by drilling a hole in the fibreglass and using a screw that is long enough to penetrate the material and hold the seat in place.
When drilling holes in fibreglass, it is important to be cautious of the hole size and the deck material. The hole size will depend on the type of screw or bolt you are using. It is recommended to test on a similar material to determine the appropriate drilling size. For example, when using a zip tie-looking plastic part, you would drill a 1/2" hole, fold the metal part up, push it through the hole, and then cut off the remaining plastic.
To avoid drilling holes in the deck, you can use a block of wood (2"x4" or equivalent) for each corner of the seat boxes. You can fiberglass these blocks to the floor and then set the seats over them. This method provides the option to screw the boxes to the blocks, but it may not be necessary if the seats are secure enough to hold without drilling into the deck.
For added security, consider using a backing plate made of aluminium or stainless steel, or fender washers to spread the load. This is especially important for items that experience a load that could pull or pry them from the boat, such as handrails, windlasses, and safety rail bases.
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Choosing the right fastener
When it comes to choosing the right fastener for bolting seats in a fibreglass boat, there are several factors and options to consider. Firstly, it is important to assess the load that the fastener will need to bear. This will help determine the type and strength of the fastener required.
One of the most common types of fasteners for this purpose is bolts. Bolts require nuts and access to both sides of the fastener hole. When using bolts, it is essential to also have a strong backing plate made of aluminium or stainless steel, or at the very least, heavy-duty fender washers to spread the load. This combination ensures that the seats are securely fastened and can withstand forces acting on them.
Another option is to use machine screws, which are similar to bolts but thread into a tapped hole. This method may be more suitable if you do not have access to both sides of the fastener hole. Sheet metal and wood screws are also an option, but it is important to note that wood screws are for wood only and should not be used on fibreglass. When using sheet metal screws, it is crucial to be precise as the reinforced laminate will not give like wood.
For those who want the option to remove the seats, clip fasteners are a viable choice. These are commonly used for bolstering side cushions and can be installed by drilling a hole in the correct location and locking the clip into place. This method does not require access to both sides of the fastener hole, making it a convenient option for those with limited access.
Additionally, some people prefer to use adhesives like gorilla glue and velcro strips, especially for upholstered seats and cushions. This method allows for easy removal and storage during the off-season.
When selecting fasteners, it is recommended to use quality type 304 and 316 screws and bolts. While purchasing these fasteners individually can be costly, it may be more cost-effective to buy in bulk from suppliers like Jamestown Distributors or West Marine.
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Using velcro to fasten seats
There are a few different types of Velcro that you can use for this purpose. One option is to use sticky-backed mounted Velcro. This type of Velcro has an adhesive backing that will stick to the surface of the boat and the seat. Another option is to use industrial-strength plastic Velcro, which can be found in speciality stores. This type of Velcro is designed for heavy-duty applications and will provide a strong and secure hold.
If you want an even more secure option, you can use Velcro hook and loop fasteners made from polyester. This type of Velcro is resistant to water, mildew, and ultraviolet light. It also provides a stronger hold than nylon Velcro. However, polyester Velcro can be more expensive than other types.
Another option for a hidden fastener is to use 3M™ Dual Lock™ Reclosable Fasteners. These fasteners provide the strength of a screw but with the ease and aesthetics of a hidden fastener. They are also easy to separate, making them a good choice if you need to remove the seats for any reason.
When using Velcro to fasten seats in a fibreglass boat, it is important to consider the weight of the seats and the amount of stress that the Velcro will need to withstand. It is also important to clean and prepare the surface properly to ensure that the Velcro adheres correctly.
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Filling holes with 3M 5200
When filling holes with 3M 5200, it is recommended to follow these steps:
- Counter sink the holes to create a fresh surface for the filler to adhere to.
- Drill out the hole to ensure it is oversized, creating a larger surface area for the filler to bond with.
- Tape the bottom of the hole to prevent any leakage of the filler.
- Fill the hole with thickened epoxy, creating a strong and durable repair.
- Use a razor blade or similar tool to trim the epoxy while it is still pliable, ensuring a smooth finish.
- Apply paint over the repaired area to match the surrounding surface.
It is important to note that 3M 5200 may not be the best option for all situations. Some people suggest using thickened epoxy or Marine Tex for a stronger and more durable repair. Additionally, 3M 5200 tends to discolour and turn yellowish over time, so it may not be the best option for cosmetic repairs.
When bolting seats in a fibreglass boat, it is recommended to fill the holes with 3M 5200. This will create a strong and durable bond between the bolts and the fibreglass surface. However, it is important to follow the correct procedure to ensure a proper repair.
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Frequently asked questions
Bolting seats in a fiberglass boat requires careful planning and execution. First, you need to assess the load that the fastener will need to handle. Choose an appropriate fastener for your specific needs. For essential components that experience a load, use bolts or machine screws to secure them. If you are unable to access the backside of the fiberglass, you may need to use a coarse screw and run it through the seat and into the fiberglass.
Bolts or machine screws must be used for essential components that might experience a load. These should be paired with nuts on the backside of the fitting. Through-bolt mounting should also include a strong backing plate made of aluminum or stainless steel, or fender washers to spread the load.
One method to avoid drilling holes in the deck is to cut blocks of wood (2"x4" or equivalent) for each corner of the seat boxes. Allow a small space between the blocks and the boxes, and fiberglass the blocks to the floor. Once the glass has cured, set the seats over the blocks.
Do not use silicone to fill the old screw holes. Instead, fill them with 3M 5200.
