Corroding window frames

[johnedwards]

I have some corrosion on the top rear of both window frames on my 97 2S.
I am inclined to take them out to send to a plater for re-anodizing.
My local body repairer thinks that they will be better repainted in situe as he considers the remounting and setting up of the frames to hold a lot of problems, ie wind noise etc, after.
Anybody any experience of becoming more involved than leaving the car with a repairer.
I would prefer to have them re-anodised and this will be impossible insitue.
Thanks in advance.
John.

 

[mwcarrera]

I think your repairer has a point. Unless you replace the door seals at the same time you may find that the frames will not reseat properly when replaced. Obviously adjustment will better the fit and careful marking of original positioning will help too. On the other hand, if the corrosion is in a position that requires dismantling anyway then you would be as well to get the job done right. I have successfully removed and repainted door frames on my cabby (front quarterlight sections only) and I guess the window fit to the hood is not as good as before? Good luck with yours, Martin

 

[johnedwards]

Thanks Martin
Sounds as though my body shop has a point.
The door seals do in fact need replacing, trouble is my wallet is feeling the pinch over other matters at the moment.
I am worried that the body shop will not manage a good match to the anodised finish. He thinks he can but the problem is you never know until you see the finished product.
Thanks again for your opinion.
John.

 

[mwcarrera]

John, if it helps, use a top coat of satin black (halfords). This matches the original look just fine. Martin

 

[johnedwards]

Thanks Martin
Still undecided I am afraid.
If I try the Halfords route it will not be put through the oven and therefor might not last.
John.

 

[Peter_Bull]

I doubt they will switch on the ovens for this anyhow - more likes taht they will just put the heat lamps next to the car.

I would do it yourself with the Halfrauds paint - cheaper option and likely to last just as long too.

 

[peterarcher]

If you are going to get this job done have it done properly by a recognised porsche body shop.
I had mine done by premier, they were bad and it cost me £650, both doors. A lot of money but they are now returned to new.
Make a nice christmas present
Peter

 

[roygarth]

Are you sure they are anodised? I think they are painted.

 

[IndischRot]

no connection etc etc - see http://cgi.ebay.co.uk/Porsche-911-964-993-door-frames_W0QQitemZ140272511635QQihZ004QQcategoryZ10408QQssPageNameZWD1VQQrdZ1QQcmdZViewItemQQ_trksidZp1638Q2em118Q2el1247

 

[johnedwards]

Thanks everybody.
phelix. Whew, I was an owner of an industrial finishing company, among other things, before I retired. I would just have loved to have been able to command a price like that for refinishing a set of window frames. If anybody wishes to do this try a few companies for quotes.
I am not sure if they are anodised or powder coated. Perhaps somebody knows for certain. Next time I'm in my OPC I will ask if anybody knows there.
Best wishes to all for Christmas and happy motoring in 2009.
John.

 

[jdpef356]

I have some corrosion on the top rear of both window frames on my 97 2S.

Lots of good advice here as to what to do - from Mr Bull's cheap'o Halfords jobbie to a full blown body shop
doing the job for £650.00 - All very good but take a look at any 993 and you will find that most if not all have the dreaded moth
in this frame area. What no one has done here is to tackle the root of the problem! I would not be putting mine in for paint
if I did not know the root cause of the problem was going to be resolved!!!!!!!!!!!!

P.S. Sorry I don't know what the route cause is other than some kind of design fault!

 

[IndischRot]

ORIGINAL: johnedwards

Thanks everybody.
phelix. Whew, I was an owner of an industrial finishing company, among other things, before I retired. I would just have loved to have been able to command a price like that for refinishing a set of window frames. If anybody wishes to do this try a few companies for quotes.
I am not sure if they are anodised or powder coated. Perhaps somebody knows for certain. Next time I'm in my OPC I will ask if anybody knows there.
Best wishes to all for Christmas and happy motoring in 2009.
John.

John - thanks for the observation on the price. I posted it to get reactions. []

I'm going to guess the OEM finish must be powder coating or paint as anodisation wouldn't bubble or lift?

 

[Peter_Bull]

ORIGINAL: jdpef356

....... from Mr Bull's ..............

Mmm .... bit formal John?

 

[peterarcher]

For everyones information the windows on my C2s were returned to factory new. And if you think that is expensive just get a quote for an OPC new set of frames including all seals - and that will put you back £3000 - don't believe me, check yourself.
Cheers
Peter

 

[mwcarrera]

The cause of the window frame alloy corrosion is partly fretting of the separate frame parts, partly accidental damage, and at the door top level - factory or repair assembly damage when the frame is squeezed into the door top. The door opening has a tape applied to prevent steel to alloy touching. This tape can be easily damaged and rust can start on the door top. If the frame coating is also damaged then differential metal corrosion is set up and alloy corrosion then flakes off the outer black frame coating.
Cure: remove all corrosion on alloy door frame (gentle grinding will be necessary) - fill and refinish as necessary. On door top, check black tape is intact or renew. Treat any rusting and refinish. On assembly, be careful not to damage coatings and use some Waxoyl, or similar anti rust fluid, to prevent further problems.
Sorry if this sounds like `teaching granny to suck eggs` to some.