Painting new disks

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Silverzedtom
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Painting new disks

Post by Silverzedtom » Sat Jan 06, 2018 6:53 pm

Just had new disks and pads arrive and want to paint the disks to prevent the rust.

Question is should I spray the inside of the hat’s or leave them as they are? My concern is the handbrake shoes on the rear’s.

The second concern is the mating surfaces. I wasn’t going to spray the faces but can’t make up my mind. They will have a couple of weeks to dry before they are mounted however this might mean the surfaces are no longer perfectly uniform.

Hopefully you’re all going to tell me to spray the lot as it’s easier :roll:

Any thoughts appreciated :thumbsup:
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Painting new disks

Post by Smartbear » Sat Jan 06, 2018 7:06 pm

Hi, I wouldn’t spray inside the drum where the shoes live-leave that bare metal.
I’ve sprayed the outside part that contacts the wheel and had no issues, it’s only a thin coating & soft enough for the wheel to pull up squarely with the torquing of the wheel bolts :thumbsup:
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Painting new disks

Post by Silverzedtom » Sat Jan 06, 2018 7:30 pm

Cheers Rob. Thought that would be the case Re shoes. Looks like I’ve sorted out my plans for tomorrow morning. :)
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patriot66
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Painting new disks

Post by patriot66 » Sat Jan 06, 2018 7:45 pm

I never paint the face that the wheel mates up to. A very thin coat of Coppaslip prevents corrosion and the wheel adhering. :thumbsup:
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Painting new disks

Post by cj10jeeper » Sat Jan 06, 2018 8:55 pm

patriot66 wrote:
Sat Jan 06, 2018 7:45 pm
I never paint the face that the wheel mates up to. A very thin coat of Coppaslip prevents corrosion and the wheel adhering. :thumbsup:
Agreed - never paint mating faces.
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Painting new disks

Post by Peterboroughdave » Fri Jan 12, 2018 11:34 pm

I am a little confused about the not painting the mating surface, i understand the risk of uneven coating resulting in miss-alignment, but if this is a real issue then what about the paint applied to the inner face of the wheels, which are subsequently bolted up against the face of the disc mounting surface. ?????

When I refurbished my discs I did not paint the mounting face, however I would like to as the disc mounting diameter is about 30 to 40mm more than the wheels mounting face, hence an annulas that has gone rusty

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Painting new disks

Post by Usel » Fri Jan 12, 2018 11:57 pm

The original paint on the discs will probably have been baked so its throughly dry or hardened. The paint you use even when dry will still be soft. When you put the wheel back on the disc could stick to the wheel. Think of when painting wooden windows or maybe doors. When dry you shut them and when you next open them they stick and need an impact force to open.
This could happen to your wheels and won't be fun if it happens.

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Painting new disks

Post by cj10jeeper » Sun Jan 14, 2018 12:05 am

Simply speaking the chances of you painting the mating surfaces and getting a flat surface are close to nil. Contaminants, blobs of paint, runs, etc will make the wheel out of true
Do it and it may get away with it, but I keep mating surface 100% clean and flat
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Painting new disks

Post by mr nurburgring » Sun Jan 14, 2018 5:22 pm

Just spray the disc face and hub part with zinc etch primer, super smooth Finnish and will stay rust free for years.
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Painting new disks

Post by Nictrix » Sun Jan 14, 2018 6:06 pm

mr nurburgring wrote:
Sun Jan 14, 2018 5:22 pm
Just spray the disc face and hub part with zinc etch primer, super smooth Finnish and will stay rust free for years.
Do you take the paint of the surface of the disc the pads run on before installing or let the pads take the paint off contaminating the new pads with paint on the first rotation of the wheels?
When I painted mine I masked off the pad area and only painted the part the pads dont run on.
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Painting new disks

Post by Smartbear » Sun Jan 14, 2018 6:29 pm

Nictrix wrote:
Sun Jan 14, 2018 6:06 pm
mr nurburgring wrote:
Sun Jan 14, 2018 5:22 pm
Just spray the disc face and hub part with zinc etch primer, super smooth Finnish and will stay rust free for years.
Do you take the paint of the surface of the disc the pads run on before installing or let the pads take the paint off contaminating the new pads with paint on the first rotation of the wheels?
When I painted mine I masked off the pad area and only painted the part the pads dont run on.
I don’t think the paint would harm the pads, it’s not like oil which could soak in & contaminate them-a couple of brake applications and it’s gone :thumbsup:
Rob
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e89 Sdrive3.0i this ones busted, pass me another
e85 3.0si-sold my trouble free car...

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Painting new disks

Post by mr nurburgring » Sun Jan 14, 2018 8:50 pm

It’s only a thin coat, just let the pads rub it off. It turns into dust and disappears leaving a nice edge.

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