Elena Rossi
Painting your bicycle's rear wheel motor hub can be a fun and rewarding project, but it requires careful preparation and execution to achieve a desirable outcome. Before starting, it is essential to disassemble the hub to access the shell, which is the only part that should be painted to avoid paint drying inside the mechanism and causing issues. Proper setup is crucial, ensuring the hub hangs freely during painting to achieve even coats. Applying primer and spray paint in multiple light coats with short intervals in between is recommended for a smooth finish. Allowing sufficient drying time before reassembling the hub is vital, and a clear coat can be applied for added protection and shine. While some opt for professional painting and relacing, others suggest exploring alternative methods like using Plastidip or Cerakote for a durable finish.
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What You'll Learn
Preparation: Hanging the wheel and taping/covering internals
To prepare for painting your bicycle's back wheel motor hub, you'll first need to hang the wheel in a way that allows you to paint without the wheel or your hanging mechanism touching anywhere you plan to spray.
One method to hang the wheel is to use a wall-mount bike rack. Purchase one online or from a hardware store, then hold the rack flat against the wall and mark the locations of the screw holes with a pencil. Drill holes, insert wall plugs or anchors, and screw the rack in place. You can then hang the wheel by placing the front tire on the rack, ensuring the tires touch the wall and the seat faces away from it.
If you'd prefer not to drill into your wall, you can try hanging the wheel from a ceiling or other structure. One option is to run a bolt through the seat post clamp and attach wire from the bolt to the ceiling. Alternatively, you can use a coat hanger or bungee cord through the head tube, or a rope with rubberized hooks looped around a sturdy structure like a tree branch.
Before painting, it's important to tape off or cover any areas you don't want to get paint on. If you're painting the hub shell, you can tape off the inside so no paint leaks in, or you can take the hub entirely apart and only paint the shell. If you're painting the rims, you can either remove the spokes or cover them with masking tape.
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Priming: Applying 3 coats of primer 15 minutes apart
To paint your bicycle's back wheel motor hub, you must first disassemble the hub and prepare the area for painting. Once you have a suitable setup, it's time to start priming. Here's a detailed guide on applying primer:
- Hang the Hub: Ensure the hub is hanging securely and is not touching any surfaces you don't want to get paint on. A suggested method is to tie a pencil through the inside of the hub with string attached to both ends, allowing you to hang the hub.
- Apply Primer Coats: Start by applying primer. You will need to apply three coats of primer, with each coat going on within 15 minutes of the previous one. This quick application ensures even coverage.
- Spraying Technique: When spraying the primer, remember not to get too close to the hub. Hold the spray can at a safe distance and perform quick, even sprays all around the hub. Don't worry if the first coat doesn't cover everything; the subsequent coats will ensure full coverage.
- Drying Time: After applying the third coat of primer, wait for 15 minutes before proceeding to the next step, which is applying spray paint.
- Avoid Overdoing It: Be careful not to over-spray or apply too much primer. Three thin coats are more effective than a single thick coat, which could drip or cause an uneven finish.
By following these steps, you will achieve a well-primed surface that is ready for the subsequent paint coats. Remember to work in a well-ventilated area and wear appropriate protective gear during the priming process.
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Spray painting: Spraying 3 coats 15 minutes apart
To spray paint your bicycle's back wheel motor hub, you should first take the hub apart and only paint the shell. This is to prevent paint from drying inside and causing issues with the internals. You can also tape off the inside so that no paint leaks in. Next, set up your workspace so that the hub is hanging from something that won't touch the area you're painting. A suggestion is to use a pencil with string tied to both ends, which is then tied to something that will hold everything up.
Now, you're ready to start with the primer. Apply three coats of primer within 15 minutes of each other. Remember not to get too close when spraying and just do quick, even sprays all around. Don't worry if the first coat doesn't cover everything as the second and third coats will. After the third coat of primer, wait 15 minutes and then apply your spray paint. Again, apply three coats 15 minutes apart. Once you've applied all three coats of spray paint, let it dry for at least 16 hours before applying the clear coat.
After the 16 hours have passed, apply three coats of clear coat, 15 minutes apart. Once this is done, let it dry for at least an hour before handling it and wait a few days before putting the axle and other components back in.
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Drying: Leaving the paint to dry for a minimum of 16 hours
After you've applied the final coat of paint to your bicycle hub, it's crucial to give it ample time to dry. Leaving the paint to dry for a minimum of 16 hours is recommended. This duration may vary depending on the paint type, environmental conditions, and the number of coats applied.
During the drying process, it's important to ensure that the painted hub is not disturbed or touched. Any contact or movement can result in fingerprints, marks, or imperfections on the paint surface. It is advised to leave the painted hub undisturbed in a dust-free and clean environment to ensure optimal drying.
The drying time of 16 hours is a minimum guideline, and it's worth noting that some paints may require longer drying times. Certain paints, such as spray paints, can take a couple of days to fully cure and harden. It is crucial to refer to the paint manufacturer's instructions or guidelines to determine the specific drying time required for your chosen paint.
Additionally, environmental factors such as temperature and humidity can influence the drying process. Warmer temperatures can accelerate drying, while cooler temperatures may prolong the drying time. Similarly, high humidity can affect how quickly the paint dries. Therefore, it is recommended to maintain a warm and moderately dry environment to facilitate the best drying conditions.
Once the paint has dried for the minimum suggested time, you can proceed with the next steps, such as applying a clear coat or reassembling the bicycle hub. However, it is important to handle the painted hub with care even after the initial drying period to ensure the paint fully cures and hardens over time.
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Clear coating: Applying 3 coats of clear coat 15 minutes apart
Clear coating is the final step in the painting process and is essential to protect the base coat from damage and UV rays. It also gives a glossy finish that deepens the base colour quality and makes it easy to buff out small scratches.
To apply the clear coat, hold the spray gun 6 to 8 inches away from the surface of the bicycle motor hub. If the surface is tilted, tilt the gun as well to remain parallel to the surface. This will give you the lightest, most even paint layers. Make steady, even passes that overlap each other by 50%. Covering half of the previous pass each time will help you achieve an even application and prevent the "tiger striping" effect.
Spray three coats of clear paint, with 15 minutes between each coat. Make sure to keep the paint thin and wet to achieve an even application and keep the drying time short. After the third coat, let it dry for at least an hour before handling it, and wait a few days before reassembling the bicycle wheel.
It is important to note that the room temperature will directly influence the finish. Extreme temperatures, whether very low or very high, may lead to paint defects such as blooming, popping, or spraying. Therefore, it is advisable to work in a temperature-controlled environment with good ventilation, ideally between 20°C and 27°C.
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Frequently asked questions
First, you'll need to decide whether to take the hub apart and paint the shell only, or to tape off the inside so no paint leaks in. Next, you'll want to set up somewhere for the hub to hang while you paint it, so that you're not touching the hub itself. You can use a pencil with string tied to both ends to hang it.
PJ1 satin black case paint is recommended by some, as well as Duplicolor or SEM from a local auto parts store. You can also use Cerakote, which is supposed to be more durable than powder coating, thinner, and better at resisting chemicals.
First, apply three coats of primer within 15 minutes of each other. Then, wait 15 minutes and apply three coats of spray paint, again 15 minutes apart. Let the paint dry for a minimum of 16 hours, then apply three coats of clear coat, 15 minutes apart. Let the hub dry for at least an hour before handling it, and a few days before putting the axle back in.
Take the hub apart and only paint the shell, or tape off the inside so that no paint leaks in. You can also try using a pencil with string tied to both ends to hang the hub while you paint it. However, if you do get paint inside the hub, it may be possible to remove it using a paint stripper or a dremel and a brass wire brush.
