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Powder coating for DaHon Aluminum 'Dalloy' frames

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Powder coating for DaHon Aluminum 'Dalloy' frames

Old 06-18-23, 03:04 PM
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Powder coating for DaHon Aluminum 'Dalloy' frames

Hi guys, this is my first post here. I'm new ish to folding bikes, but used to commute on a Raleigh 20 Stowaway (which was very fun, but very heavy). I've just got an old DaHon Vybe off eBay and I've stripped it down completely for rebuilding/ modifying.

I'm just curious if anyone has sand/shot blasted down and powder coated any DaHon 'Dalloy' aluminium frame before? If so, did it go well?

The current paint job is in pretty poor condition. I've got a quote from a car alloy repairer near me (in the UK) for 50 for shot blasting and powder coating. They've told me the powder is baked on at 180C for 20 minutes. I'm a bit worried about affecting the strength of the frame by heat treating it.

I've tried to read all I can about the risk of heat treatment on aluminium bike frames, but it seems like it really depends on the tempering of the specific grade. From what I can tell, the Dalloy grade sounds like it is tempered to increase hardness, and I've read that tempering (artificial ageing) of some grades can be at temperatures as low as 100C. I tried sending an email to DaHon, but I doubt I'll get a response (not least because it's their IP).

Since it's a budget bike, I'd rather not pay hundreds for a proper paint job. The powder coating is tempting because of how durable it would be too.

Plan B would be to just ask them to do the shot blasting, then paint the thing myself with a rattle can I guess.

Has anyone been down a similar road to this?

Thanks, Henry
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Old 06-19-23, 09:25 AM
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Originally Posted by HenryC
Hi guys, this is my first post here. I'm new ish to folding bikes, but used to commute on a Raleigh 20 Stowaway (which was very fun, but very heavy). I've just got an old DaHon Vybe off eBay and I've stripped it down completely for rebuilding/ modifying.

I'm just curious if anyone has sand/shot blasted down and powder coated any DaHon 'Dalloy' aluminium frame before? If so, did it go well?

The current paint job is in pretty poor condition. I've got a quote from a car alloy repairer near me (in the UK) for 50 for shot blasting and powder coating. They've told me the powder is baked on at 180C for 20 minutes. I'm a bit worried about affecting the strength of the frame by heat treating it.

I've tried to read all I can about the risk of heat treatment on aluminium bike frames, but it seems like it really depends on the tempering of the specific grade. From what I can tell, the Dalloy grade sounds like it is tempered to increase hardness, and I've read that tempering (artificial ageing) of some grades can be at temperatures as low as 100C. I tried sending an email to DaHon, but I doubt I'll get a response (not least because it's their IP).

Since it's a budget bike, I'd rather not pay hundreds for a proper paint job. The powder coating is tempting because of how durable it would be too.

Plan B would be to just ask them to do the shot blasting, then paint the thing myself with a rattle can I guess.

Has anyone been down a similar road to this?

Thanks, Henry
I highly doubt that 180c is going to temper your Dahon.
There are very specific alloys of aluminum that actually might be affected but they are not used in cycling.

When you do have it powder coated, I'd suggest it be separated into its specific parts (not left connected at the hinge)
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Old 06-20-23, 01:53 PM
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Originally Posted by HenryC
Hi guys, this is my first post here. I'm new ish to folding bikes, but used to commute on a Raleigh 20 Stowaway (which was very fun, but very heavy). I've just got an old DaHon Vybe off eBay and I've stripped it down completely for rebuilding/ modifying.

I'm just curious if anyone has sand/shot blasted down and powder coated any DaHon 'Dalloy' aluminium frame before? If so, did it go well?

The current paint job is in pretty poor condition. I've got a quote from a car alloy repairer near me (in the UK) for 50 for shot blasting and powder coating. They've told me the powder is baked on at 180C for 20 minutes. I'm a bit worried about affecting the strength of the frame by heat treating it.

I've tried to read all I can about the risk of heat treatment on aluminium bike frames, but it seems like it really depends on the tempering of the specific grade. From what I can tell, the Dalloy grade sounds like it is tempered to increase hardness, and I've read that tempering (artificial ageing) of some grades can be at temperatures as low as 100C. I tried sending an email to DaHon, but I doubt I'll get a response (not least because it's their IP).

Since it's a budget bike, I'd rather not pay hundreds for a proper paint job. The powder coating is tempting because of how durable it would be too.

Plan B would be to just ask them to do the shot blasting, then paint the thing myself with a rattle can I guess.

Has anyone been down a similar road to this?

Thanks, Henry
Although Dahon likes to pretend that their aluminum is exclusive to them and deserves a unique moniquer, I believe it is either 6061 or 7005 alloy. 6061 tempers at 990 degrees fahrenheit and 7005 takes a long time at relatively low temperatures to temper. So, you should have no problem at all.
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