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 Refurbishing part-metal centre caps, e.g. 8D0 601 165K View next topic
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HPsauce
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PostPosted: Wed Apr 22, 2015 10:30 am  Reply with quoteBack to top

Having stripped the varnish from the metal flange (with Nitromors) and tried polishing out the pitting and corrosion I think it's too bad to get a decent finish for lacquering.
Considering chrome paint for them, has anyone tried that?
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HPsauce
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PostPosted: Wed Apr 22, 2015 4:26 pm Reply with quoteBack to top

Chrome paint it is, just been to Halfords to stock up.
Progress so far: dismantled, flange stripped(!) rubbed down and primed, rings cleaned (descaler) and glued with Araldite, centre resprayed "Steel".

As the component parts are now:


Once that's dried (tomorrow) I'll refit the rings and spray the centre with a lacquer coat which will also protect/secure the rings.
The flange will be sprayed with chrome (no lacquer on that) and refitted when totally dry - another day probably.
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tanoga
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PostPosted: Wed Apr 22, 2015 4:39 pm Reply with quoteBack to top

Wwwwwaaaaaaayyyyyy tooooooooo much f*cking about for my liking. Buy a new set from Audi and take you old set back after 23 months and claim under warranty Fair game seeing as the price they charge must be for 2 sets anyway

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HPsauce
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PostPosted: Wed Apr 22, 2015 11:12 pm Reply with quoteBack to top

Noggymike wrote:
you need to press hard/evenly to re seat them properly, which normally results in them breaking again where you have glued them.
Three glued joints, just one broke. But it's pretty solid and lacquer will secure it.

These rings seem to be some sort of cast metal. Those on the cheap Chinese copies are plastic.
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Noggymike
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PostPosted: Thu Apr 23, 2015 10:18 pm Reply with quoteBack to top

HPsauce wrote:
Noggymike wrote:
you need to press hard/evenly to re seat them properly, which normally results in them breaking again where you have glued them.
Three glued joints, just one broke. But it's pretty solid and lacquer will secure it.

These rings seem to be some sort of cast metal. Those on the cheap Chinese copies are plastic.



In my experience I found them to be plastic with a very unique hard chrome style coating on, which was prone to pitting and tarnishing very badly. The OEM finish was not replicable with my attempts anyway. Not sure the lacquer will hold up in the long term but worth a go I guess.


The OEM plastic centre on the RS4, are not lacquered, but not sure about finishes put on other models.

Tbh, I think you will struggle with the chrome finish on the outer alloy ring part though, as I tried some similar paint myself and found it never really hardens properly, even after a few weeks it was soft to the touch even with the proper pre preparation guidelines. If you do get a reasonable finish I would not leave it open to the elements though as I'm sure it would require some proper sealing to keep the finish.

Keep us updated

 

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HPsauce
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PostPosted: Thu Apr 23, 2015 11:44 pm Reply with quoteBack to top

Noggymike wrote:
Tbh, I think you will struggle with the chrome finish on the outer alloy ring part though, as I tried some similar paint myself and found it never really hardens properly, even after a few weeks it was soft to the touch even with the proper pre preparation guidelines. If you do get a reasonable finish I would not leave it open to the elements though as I'm sure it would require some proper sealing to keep the finish.

Keep us updated

Yes indeed, it's soft after 8 or more hours and the instructions say to NOT apply lacquer!
BUT I did a test elsewhere and the lacquer (applied thinly) does take, so tomorrow I'll try that in multiple coats allowing solidification in between..
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HPsauce
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PostPosted: Fri Apr 24, 2015 5:28 pm Reply with quoteBack to top

Noggymike wrote:
I think you will struggle with the chrome finish on the outer alloy ring part though, as I tried some similar paint myself and found it never really hardens properly
You're right, it's rubbish and soft; doesn't even look that chrome-like.

So I lacquered it to give some protection and it's just boring grey now and still fairly soft.



As all four centres are fairly corroded I think I'll just paint the metal flanges with silver paint.
I normally use Ford Moondust Silver for repairs on wheels as it's a good match and somewhat sparkly.

Chrome spray paint consigned to the dustbin of bad learning experiences.
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C J
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PostPosted: Fri Apr 24, 2015 5:37 pm Reply with quoteBack to top

Quite like how that looks yno. Think you've done well with that.

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HPsauce
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PostPosted: Fri Apr 24, 2015 6:03 pm Reply with quoteBack to top

Thanks.  
The flange is already marked due to being a bit soft, so no good on the car as it will get worse quickly, but the colour is good.
I'll strip it off and respray with Moondust Silver.
I took the flange off and resprayed the top half with Moondust Silver to compare.

Too bright really in this picture, but it's slightly lighter and sparklier. And will DEFINITELY be harder when stripped back and applied properly.

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Noggymike
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PostPosted: Fri Apr 24, 2015 6:54 pm Reply with quoteBack to top

HPsauce wrote:

The flange is already marked due to being a bit soft, so no good on the car as it will get worse quickly, but the colour is good.






You have the worst bit left to come as well.


How good are the outer edges on the alloy ring?

If they are split, they will fold awkwardly as you re fit them resulting in a slight point on the outer edge.



What are you sealing them with?

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HPsauce
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PostPosted: Fri Apr 24, 2015 7:39 pm Reply with quoteBack to top

Mike, the outer edges are pretty intact, just tiny nicks at the very edge (that will end up behind).
I took them off carefully, working round several times with a thin flat screwdriver to peel back the edges slowly and plan to roll them back over gently in similar multiple stages.
I only opened them up enough to take off, so the edges go "backwards" and are basically intact. Any edge damage that I do refitting will be out of sight.

The backing I sprayed "Steel" and then lacquer after refitting the rings to make them more secure.

The flanges I plan to spray Moondust Silver then lacquer and leave to dry before refitting.

I've started dismantling a second one to try all that on.
The rings I just pushed out carefully in sub-millimetre steps from behind working round the lugs in turn, but they were already broken so will be fixed with Araldite.
The flange I will try just rubbing down (not stripping) then paint on top. If that looks bad I'll strip it off to bare metal and start with primer.
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Noggymike
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PostPosted: Fri Apr 24, 2015 7:56 pm Reply with quoteBack to top

HPsauce wrote:
Mike, the outer edges are pretty intact, just tiny nicks at the very edge (that will end up behind).
I took them off carefully, working round several times with a thin flat screwdriver to peel back the edges slowly and plan to roll them back over gently in similar multiple stages.
I only opened them up enough to take off, so the edges go "backwards" and are basically intact. Any edge damage that I do refitting will be out of sight.

The backing I sprayed "Steel" and then lacquer after refitting the rings to make them more secure.

The flanges I plan to spray Moondust Silver then lacquer and leave to dry before refitting.

I've started dismantling a second one to try all that on.
The rings I just pushed out carefully in sub-millimetre steps from behind working round the lugs in turn, but they were already broken so will be fixed with Araldite.
The flange I will try just rubbing down (not stripping) then paint on top. If that looks bad I'll strip it off to bare metal and start with primer.



You need to strip them properly before painting as they are lacquered and the paint will not take to them with any residue.

You mentioned they were a chrome OEM finish, if that's the case then normal primer will be fine.

If they are brushed finished and damaged (scoring,pitting,tarnishing) then it is game over tbh.  Then you will need vast amounts of filler primer to fill in the effect and go for a smooth finish instead

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HPsauce
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PostPosted: Sat Apr 25, 2015 12:19 pm Reply with quoteBack to top

Mike, they were just the smooth polished (soft) metal with a lacquer coat. No chrome, no brushed effect, just shiny (with corrosion).

I think metallic silver paint with a lacquer topcoat will actually be a better match to the wheels.

A lesson I've learned is to take it VERY slowly; I'm letting the parts dry now for at least 24 hours on my warm boiler between primer/paint/lacquer layers.

PS I also have a set of four (new, intact, shiny) plastic 4-ring components from some cheap Chinese centres (4BO 601 165A) I bought a long time back that weren't correct.
One I had already butchered to try to fit (failed) and recently sent the spring ring clip to Professor Peach as he had lost one of his - saved him some grief!
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HPsauce
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PostPosted: Sat Apr 25, 2015 3:07 pm Reply with quoteBack to top

HPsauce wrote:
I've started dismantling a second one
All four taken apart now, here's some tips for anyone else doing this:

1. Clean in hot soapy water first and leave to soak for an hour or so to soften the hidden road grime that "glues" it together.

2. Remove the centre 4-ring logo first with the centre face down. Just push down each lug in turn to move a bit then again until it "clicks" over the lip and finally into the hole with a thin tip to release fully. They will probably already have at least one fracture. As noted earlier, I cleaned these effectively with bathroom descaler and glued any breaks with Araldite.

3. Work round the outer flange from behind with a small flat screwdriver, lifting the overlapped edge just 45 degrees initially. Soak again.

4. Work round again lifting to 90 degrees. Then, carefully unbend the three retaining lugs on the back until vertical and flat using small pliers and soak again.

5. Finally, face up, press down on the centre with your thumbs while gently lifting and working round the edge with your fingers to free the flange. You will find a LOT of sticky muck behind.
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HPsauce
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PostPosted: Sat Apr 25, 2015 6:19 pm Reply with quoteBack to top

Noggymike wrote:
you will need vast amounts of filler primer
I've found a function for the otherwise useless Chrome paint! It makes pretty good filler/undercoat over primer for smoothing.

The backing is all done: sprayed "Steel", rings cleaned/glued and refitted and a lacquer coat to seal/fix.
(Just got to finish the flanges and refit - still a fair bit of work there.)


And for those of you with OCD, yes the bottom left one IS upside down compared to the other three!  
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