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  #11  
Old 02-02-2019, 09:11 PM
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Join Date: Jun 2015
Location: Southlake, Texas
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X53Jay4.8is is on a distinguished road
Quote:
Originally Posted by jsoto View Post
My previous one had a weep - attributed it to a old slightly warped VC.

New VC were PC. I've been semi ignoring the issue....as the job looked good but the finish has been bubbling. Has not flaked off, but for sure there are area's where it's bubbled and not on the surface. I know magnesium is quote porus and I'm pretty sure my PC was on point with PREP.

Anyhow, just typing outoud for those that have had the VC PC. How's it been for you on the finish ?
I'm debating whether to even head the route of redo PC on the VC .

I know magnesium is a b1tch to get right on prep. I went over the details with the PC. He's done wheels and calipers and such in the past for me.....
We were clear on the prep since it's mag.
I dunno if it's worth the effort to do a round 2..
I'll just say that if its done right, then the finish lasts without bubbling. I have had 4 sets of valve covers done in PC all by the same powder coater. The oldest on in service is going on 6 years and still in perfect shape. The newest set of valve covers was done 2.5 years ago on the 4.6is and is still in great shape. I would suspect that the magnesium valve covers in your case were not properly prepped (outgassed long enough to clear the impregnated oil).
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  #12  
Old 02-02-2019, 09:15 PM
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Quote:
Originally Posted by Rokolya87 View Post
I took my covers off when we were replacing chain guides. Simply used oven degreaser, then sandblaster and finally clear coat. Looks classy IMHO.
Did you outgas the valve covers before painting them/clearing? This needs to be done to assure that the finish will last.
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  #13  
Old 02-03-2019, 03:26 AM
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Yeah, I pre-baked the parts at 500F, a temperature that is a bit higher than the cure temperature for about 15 min after sandblasting. This drove the bulk of the entrapped gas out, which is more than enough in my case.
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  #14  
Old 02-03-2019, 04:40 PM
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Quote:
Originally Posted by Rokolya87 View Post
Yeah, I pre-baked the parts at 500F, a temperature that is a bit higher than the cure temperature for about 15 min after sandblasting. This drove the bulk of the entrapped gas out, which is more than enough in my case.

Your finish should last then.
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