If you wet sand them very lightly with high grit paper the cleap coat will work. Wont ruin the finish either as long as you go very lightly and very high grit
paper.
Last time I sanded them up to 2500 grit, them metal polished to a mirror(ish) finish........they looked great, for 5 minutes
The wheels were originally clear coated, but it failed and they looked like ****e with brake dust getting underneath the clear coat.....hence the reason for me polishing them in the first place
As they're split rims I'm worried about the perimeter bolts cracking the clear coat, and it then failing all over again
Bringing this back to life
It's time to refurbish my wheels again
Since I'm a fool I decided I'd remove the paint from the centres and polish them up too - just wanted to know what it'd look like
Well, I kind of like the look, but can't handle the maintenance, or constant need to polish them any longer
So, I need some help with my options......
I can't leave them bare polished - I can't maintain them
I could anodize them - but the centres are cast not forged and I'd heard cast alloy could look patchy - also anodizing could stain if chemicals are used during cleaning
I've been told by someone recently that he polishes his wheels and then clear coats them with TSC clear
He says once its hardened it won't ever fail, even on a mirror polished finish
So, if that's true I'd quite like to polish the centres and outer rims and coat them with TSC clear
If that's not quite correct I've been thinking about powder coating the centres again and then replacing the outer rims with stainless steel items
Has anyone got any experiences with TSC on a polished finish, or using stainless steel rims?
I like the idea that the rims won't oxidise like the alloy ones, but I'm unsure about brake dusts sticking to them - guess ill just need to keep applying wax to them
Anybody got some good advice for me?
Thanks again everyone
Powdercoat is some very tough stuff. Find a powdercoater that specializes in automotive/motorcycle not someone who does a lot of heavy equipment/tractors. The finish seems to look better; now the industrial type coating may last longer, I don't know
2nd option is a clear epoxy paint. These are very tough and can be reapplied as necessary. Sharkhyde is a brand that has a wipe on clear epoxy (a lot of big-rig and pontoon boat guys use this stuff. It can be reapplied in small spots with an aresol can; however it doesn't last forever. I think it lacks a hardener, so it allows you to re-coat, but its not incredibly durable.
Option 2b would be a 2 part clear epoxy and then buff smooth.
Anodizing can appear splotchy on some cast parts. I would check with your plating shop and see. Some places specialize in that type of low volume hand-work.
What do you think is the root cause of the majority of the damage? Perhaps this isn't a 1 step approach. If most of the damage is say abrasion from road debris and disassembly/reassembly thats one thing. If, however the damage is caused by an overly caustic mix of wheel acid and brake dust; perhaps re-evaluating your post race prep procedure will help bring back some longevity.
I don't think your problem is due to normal corrosion. What I see is electrolysis happening from the steel bolts and nuts corroding and the dismilar metals reacting. As long as you keep cleaning them up, they'll never stop corroding until you clean them and change all the bolts to the new SS bolts you have.
Once they're really cleaned and neutralized, and the new SS bolts installed, then it should stop the corrosion from returning. Make sure you change the nuts and any washers to SS also, or it will still return.
I've rebuilt the wheels with stainless bolts, but so far I can only find plated mild steel nuts
The fixings are M7 in size, so they're pretty awkward to come by
The guys I got the bolts from are the biggest suppliers in Europe (that I know of) and they don't do stainless nuts in M7
Anyone got any leads?
Also, the main issue I'm having wit the wheels is brake dust and road dirt
I'm in England, and the weather isn't great for polished rims
Lots of dirt and salt around all through the year
If I don't keep on top of the wheels all the time (which I don't because I use the car daily) they become pitted again
I really can't keep the wheels bare polished
I've got a good powder coater that I've just started using, but I haven't shown him these wheels yet
Im worried it won't be possible to powder coat a polished surface and get good adhesion, so I'm at a loss right now
I've recently seen some guys say they restore wheels...... But you wouldn't believe the amount of money they wanted from me
They say their process is as follows....
Strip and shotblast inner and outer rims and centres
Anodize all three components
Polish the anodizing on all three components
Powder coat inner rims and centres in silver
Powder coat outer rims in clear
It sounds like they're pretty thorough
But - would you really blast the wheels? - wouldn't that give too much of a textured finish?
And then after anodizing the pieces they polish them? Wouldn't that just remove the anodize?
Can you really mirror polish anodizing?
I really don't know what to do for the best
My ideal end result is a fully polished wheel with a durable protective coating
If that's not possible, I think my next best option might be to buy stainless outer rims and have the centres powder coated in silver (instead of clear, as they wouldn't match the steel rims would they?)
If I can't get stainless flange nuts should I just fit regular nuts with a washer?
Here's some pictures of the wheels whilst I've been messing around with them
You might be able to make out the pitting in the rims before I polished them
Not being a metric guy, I have no idea what an M7 bolt or nut is. I can't imagine that a specialty hardware outlet would not be able to order the SS nuts if you contact them. If you put regular nuts back on the salt will attack them, and then the problem will migrate to the wheels again. It will take longer to get to the front side, but it will eventually happen.
Most things in metric are in even numbers though, and an M7 is almost unheard of
I can get M7 nuts with a flange on them but they're coated mild steel
I can also get stainless M7 nuts, nut they're just regular nuts without a flange on them
Do you think it'd be ok to use regular stainless nuts with a stainless washer in place of a flange nut?
Also, as mentioned, the real problem I'm having is brake dust and road dirt
So, once i've changed the nuts I need to know how to properly protect the wheels from the elements
Either.....
1) Clear powder coat over the polished rims and centres
2) Stainless outer rims, and silver powder coat over (properly keyed) centres
Option one is my preference, but I don't know how the powder coat would adhere to a polished surface
If it won't hold properly I think option two is my only real choice
But, option two is far more expensive
What I really want is low maintenance wheels
I know I should just buy another set, and I might end up doing that, but I want to keep these ones if I can keep the maintenance to a acceptable level
Contact these folks. They handle a lot of aerospace, aviation and marine stuff. Incidentally, you can't be the only fellow with a Porsche that has this problem. It might be worth looking into sourcing a larger quantity and offering them to other enthusiasts, or doing a 'group buy' to offset the cost/shipping.
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