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Chart928s4 explain it well. I think magnesium does gas-out as other E38 owners also had same problem with powder coating the valve cover later on, wasn't permanent solution, that's why I want to try thin coating/ plating instead. Here's the link: https://www.sanchem.com/magnesium-co...-coatings.html
PM me if you want the full story. Short version is: Beat the crap out of the old coating with anything that will work (wire wheels), bake the parts at 200 for 4 hours, wash (especially inside the intake) with a dryer brushand change the water 6 times using Zep Citrus Degreaser, rinse thoroughly, spray on white vinegar, rinse again, dry, brush liberally with Sanchem 3400 and air dry, spray with Cerakote Glacier (ambient air cured) within a few hours.
Brian @olmann 's thread was the inspiration. The man is a legend among intake DIYers. The air cure Cerakote is fantastic in every way and is the only thing I can do to improve on his excellent thread.
HA! Legend, I don’t think so but thanks for the compliment! The process has worked well and held up great over the years. You are spot on with your process. I need to give Cerakote a try. Looks like a good way to go. I have been doing single stage urethane paint lately with a little less gloss. Always looking to improve!
Thank you, actually. First guy to consult metallurgy/chemical engineers instead of just trying something I think. That counts for a lot on the Internet (or anywhere else). Apparently they know what they're doing, because mine too is holding up exceptionally well. Y
our original intake paint looked like it yellowed a little just like the original, so that was pretty awesome also. You will love the Cerakote - get the pint size which is 2x what you'll need.
BTW I hope someday to be able to have enough 928's to say "I'm using <x technique> now." Just the one car keeps me busy enough.
Yes, it did yellow more than I wanted although it did still look good. I went through that whole process then used a cheap clear that caused the yellowing. That is why I have changed to the single stage to get away from the possible yellowing of the clear. Here are some pics of when I first painted it before any of the yellowing. I used a different color than Zerrmatt although it is close to the same. The following photos are after some yellowing and then when I refinished them again with single stage Zermatt before selling the car.
Before yellowing Before yellowing After some yellowing Single stage Zermatt
03-24-2020 | 07:07 PM
