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  BMW Forums » BMW discussion forums » BMW Z-Series
  powdercoated coilover spring

 powdercoated coilover spring



This past weekend I found some rust on one of my coilover springs. Nothing major, but the bottom 2 coils had sandwiched some durt and ground through the powdercoating. Since I was never a big fan of the Mardi Gras color scheme of the KW V3 (yellow springs, purple perches), I decided it was time to strip and try a different color powder.

Coil stripped (before last steps of chemical cleaning).



Coil powdered in HB Fuller light gray.



I may or may not stick with this color, but I needed to get something on there to stop the rust. Of course, now I've got one light gray main spring and all my other ones are still yellow (including the helper spring for this coilover).

I'm growing tired of HB Fuller polyester TGIC powders. Some of the colors flow out very smoothly (the Black Magic, the Silver Sparkle, the translucents), while others don't flow out smoothly at all (the light gray being a good example). I shouldn't have to wetsand and polish afterward, I never need to with the powders from columbiacoatings.com.

Time to try another brand for solid colors. Ron, any suggestions for a reasonably large color selection? I can get some solid colors from columbiacoatings.com, but their selection is fairly limited.
   Reply » powdercoated coilover spring

Quote:
Time to try another brand for solid colors. Ron, any suggestions for a reasonably large color selection? I can get some solid colors from columbiacoatings.com, but their selection is fairly limited.
The place I use, uses mainly Tiger Drylac (RAL standard).
www.tigerdrylac.com

Also use Marton for the BMW semi black look a like and safety yellow.

Connect to: http://www.unofficialbmw.com/all/too..._coatings.html

   Reply » powdercoated coilover spring

Daniel, you aren't concerned with the heating necessary to bake the powder possibly hurting the spring?

   Reply » powdercoated coilover spring

Quote:
Daniel, you aren't concerned with the heating necessary to bake the powder possibly hurting the spring?
No. Springs are treated at much higher temperatures. From memory (don't quote me), they're typically austenitized around 850C, oil-quenched, and tempered around 400C. Somewhere I have some related SAE documents, though I'd be hard-pressed to find them.

To the best of my knowledge, nearly all (if not all) springs in production vehicles for the last two decades have had polyester powdercoated springs, 40 micrometers or thicker application. It's inexpensive, and it holds up very well to salt spray and chemicals (including brake fluid).

   Reply » powdercoated coilover spring

black

   Reply » powdercoated coilover spring

Quote:
black
Definitely not black; looks like heck before I get to pavement.


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