Author Topic: Polishing aluminum - Share your tricks and tips  (Read 3121 times)

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ElCheapo

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Polishing aluminum - Share your tricks and tips
« on: January 09, 2006, 08:43:02 PM »
Ok, I went out today and got one of those buff pad kits for $15. Has 3 pads and 2 sticks white and 2 sticks red/brown. Not a bad deal anyway.

I did the brake cap for the K5 and man what an improvement. It's not perfect, but it is really close. I was having a hard time with the grip slots. I guess I will get it later with the dremel and a small pad.

The part I found the hardest was the inital cut in. The finish that is on most of the handle bar aluminum parts is hard to cut through. I used a wire wheel on my bench grinder to cut through at first  :o, It did the cut through fast but did not give me the finish I was hoping for. This made for lots work when it came to polishing to get rid of the lines.

I was considering using this little deal we used to use to clean the gasket surfaces for aluminum heads.



These worked really good for cutting through gasket gunk on an aluminum head without eating the surface even if you were a bit clumsy.  ;D

So right now I do

1. Cut in with wire wheel
2. Sand with 600
3. Buff with red
4. Buff with white
5. Finish with cloth diaper and Brasso

Anyone have any better ideas?  ???

« Last Edit: January 09, 2006, 08:45:26 PM by ElCheapo »

Offline cbjunkie

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Re: Polishing aluminum - Share your tricks and tips
« Reply #1 on: January 09, 2006, 08:46:21 PM »
are those rubber fingers? where do you get one of those things?

i've been going with the "soft" polish - it looks like mom's old silver service...i actually like it better than the mirror finish, but i can understand the attraction of that as well...

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ElCheapo

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Re: Polishing aluminum - Share your tricks and tips
« Reply #2 on: January 09, 2006, 08:48:56 PM »
Yea they are rubber. But you have to use the yellow ones, the other colors are more agressive. Good for eating up rust and the like.

Last I knew you could get them at most auto parts stores. They are a bit expensive at $4 each but you could get through an entire 6 month season with just one. But you have to have the little rol-loc arbor for your grinder or drill.

Scotch-Brite™ Roloc™ Bristle Disc 07527 Yellow, 3 in
« Last Edit: January 09, 2006, 08:51:13 PM by ElCheapo »

Offline cbjunkie

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Re: Polishing aluminum - Share your tricks and tips
« Reply #3 on: January 09, 2006, 08:52:44 PM »
the proprietary lock? i'll look for this thing next time i go by the autostore...this would be great on my side grinder...
1971 750K1
1972 CB350 (deceased)

sometimes naked, sometimes mad -
now the poet, now the fool -
thus they appear on earth,
the free men.

ElCheapo

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Re: Polishing aluminum - Share your tricks and tips
« Reply #4 on: January 09, 2006, 08:55:33 PM »
the proprietary lock? i'll look for this thing next time i go by the autostore...this would be great on my side grinder...

That is exactly what I used it on. Best part is this arbor fits all the other 3M stuff, like the all the abrasive "Cookies" ;D

eBay link for the arbors

http://cgi.ebay.com/QTY2-3-ROLOC-TYPE-R-MANDRELS-FOR-3M-DISCS_W0QQitemZ6028191789QQcategoryZ20796QQrdZ1QQcmdZViewItem
« Last Edit: January 09, 2006, 09:00:02 PM by ElCheapo »

Offline Jonesy

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Re: Polishing aluminum - Share your tricks and tips
« Reply #5 on: January 10, 2006, 05:16:17 AM »
I mentioned this in Raul's polishing thread, but for your first cut try a coarse cotton wheel (Optional) and black emery compound. The black compound it the most coarse and is good for initial cut. I start with the black, then go to Tripoli brown, and finish with White Rouge (white stick). I do a final hand buff with Simichrome and an old flannel shirt (I'm afraid my grunge rock days are over..).

Hope this helps!

(Edit: I re-posted the guide to polishing compounds here:)
Emery Cake: Contains an emery abrasive, providing a sharp, fast cutting action for removal of rust or scale from iron, steel, or other metals.

Tripoli Brown: Brown compound for buffing aluminum, pewter, brass, copper, wood, bone, plastics, painted, and other soft surfaces.

Red Rouge: Red compound for initial buffing, cleaning for a bright luster on silver plated, gold, sterling and other precious metals.

White Rouge: White rouge buffing compound gives a bright, shiny luster to stainless steel, aluminum, iron, chrome and nickel surfaces.

Green Rouge: Green buffing compound for fine color buffing and light cleaning on all classes of metals. Produces a bright lustrous buffed surface.

Blue Rouge: Blue buffing compound for final high-luster color buffing on gold, silver, sterling, platinum, and other precious metals. Produces a bright, lustrous buffed surface.
« Last Edit: January 10, 2006, 05:24:00 AM by Jonesy »
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Offline 6adan

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Re: Polishing aluminum - Share your tricks and tips
« Reply #6 on: January 10, 2006, 06:19:42 AM »
After everything is polished should parts be clear coated ? Some would be hard to get to when back on the bike. Dannie
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Offline Bob Wessner

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Re: Polishing aluminum - Share your tricks and tips
« Reply #7 on: January 10, 2006, 06:25:30 AM »
Might be worth reading through this earlier related thread. There is one comment that clear coat will not adhere to highly polished surfaces.. makes sense.

http://www.sohc4.us/forums/index.php?topic=6397.0
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Offline 74cb750

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Re: Polishing aluminum - Share your tricks and tips
« Reply #8 on: January 14, 2006, 07:51:29 AM »
I thought andynzl had some comments on polished painted surfaces. Need to get his input on this thread.
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ElCheapo

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Re: Polishing aluminum - Share your tricks and tips
« Reply #9 on: January 14, 2006, 08:45:37 AM »
Cool Jonesy, I'll try those tech tips of yours  ;D

Offline Quail "Owner of the comfortable k8"

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Re: Polishing aluminum - Share your tricks and tips
« Reply #10 on: January 14, 2006, 05:32:38 PM »
I have been powdercoating the clear, have not had any lift off yet.  A rattle can clear will spider crack in 1-2 years.  I would tell you my buffing secrets but I would have to kill you after I did so.  Well I don't know where you live so I would have to kill someone that looks like you.  I really have know idea what you look like so I guess I will just follow my dogs advice and kill at random. 

I sand and buff on 3 seperate wheels, it takes forever and makes my hands tired.  Ok I have to go now.
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Offline ofreen

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Re: Polishing aluminum - Share your tricks and tips
« Reply #11 on: January 14, 2006, 06:05:57 PM »
Years ago, the fork legs on the 750 were looking pretty sad, nicked and corroded from the crap they put on the roads in AK.  I found that hand sanding wet with 400 grit wet/dry very closely duplicated the factory finish on the fork legs.  I followed up with clear coat from a spray can.  Probably Krylon, since that's what they sold at the Pay'N'Save in Soldotna.  The same paint is still on there today, and that was around 14 years ago.
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Offline 6pkrunner

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Re: Polishing aluminum - Share your tricks and tips
« Reply #12 on: January 15, 2006, 02:02:28 AM »
I start at either 80 or 100 grit paper, depending on how badly scrapped or pitted the part is. Work down on dry sandpaper to 200 grit. Then use wet paper in 220, 400, and then 600 grit. Then for aluminum, skip the brown cake and got to the red emery cake. Then if its pretty clean and free from scratches you can got to the white rouge. This will make a mirror finish if you got long enough at it. I try to replicate the factory shine - or maybe a notch shinier, but not into the super-high shine area.
And yes with this amount of material on the aluminum, clear coat will not adhere for long. So a little buff with white rouge every other week is all that's needed to keep on top of it.

Offline 750goes

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Re: Polishing aluminum - Share your tricks and tips
« Reply #13 on: January 15, 2006, 03:56:28 AM »

Local wrecker recommended a polisher near him...gave him an oil filter housing and 5 seconds later it looked pretty good....cannot post photos until later as camera is away on annual holidays, suffice to say I'm probably going to get him to do the bits..

But to keep things nice and shiny his tip was not to use anything as a clear coat, but to use the old MR SHEEN, once a week on a cloth, and just wipe it over..he mentioned that this will put a minimal layer over the polished bits, and gives a constant shine to the parts done. Wrecker had some covers done for a Kawasaki, so will post a few pics of that one as well when possible...

Offline lefty2023

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Re: Polishing aluminum - Share your tricks and tips
« Reply #14 on: January 22, 2011, 04:53:03 PM »
i have a question!? when i get done polishing with a black, brown and white compound and i think i am just about done. but there still is like this haze in some spots and its nice and shiny in other spots. i dont get it, i had it when i polished my forks and now when im polishing my chain cover.  am i put to much compound on my buffing wheels? i am sanding up 1000 grit before buffing.  am i not applying the right pressure when i am buffing?
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Offline q2418130103p

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Re: Re: Re: Polishing aluminum - Share your tricks and tips
« Reply #15 on: January 23, 2011, 01:42:08 PM »
i have a question!? when i get done polishing with a black, brown and white compound and i think i am just about done. but there still is like this haze in some spots and its nice and shiny in other spots. i dont get it, i had it when i polished my forks and now when im polishing my chain cover.  am i put to much compound on my buffing wheels? i am sanding up 1000 grit before buffing.  am i not applying the right pressure when i am buffing?

I have noticed the same thing, but only on this bike.  Pieces for my car look prefect using the same process that I always use.
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Offline gane

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Re: Polishing aluminum - Share your tricks and tips
« Reply #16 on: January 23, 2011, 03:33:52 PM »
If yer OCD, & want the highest shine, combine flour or cornstarch w/ your' favorite compound (I should own stock in Haphich) It absorbs the black oxide that come out w/final polish. G

Offline apex_seeking

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Re: Polishing aluminum - Share your tricks and tips
« Reply #17 on: January 24, 2011, 09:35:25 AM »
I finish everything up with billet polish. It's a little pricey but cleans and seals the final surface.

Offline Kong

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Re: Polishing aluminum - Share your tricks and tips
« Reply #18 on: January 24, 2011, 03:31:10 PM »
I took my first shot in a long time at polishing aluminum earlier today.  At the end of the year I bought one of the Caswell buffing kits, which included the 3/4 hp. buffer and a number of wheels and compounds.  It finally arrived today and I temporarly bolted it down to my bench and gave it a try on one spindle.

Clearly I've got a good bit to learn, but I'm still impressed with the machine.

I started with a 550 shift/sprocket cover that I had sanded to 400 grit a couple of weeks ago.  It showed me that it needs more work and so do I.  I also tried a front hub (CB550) that I have apart waiting for new spokes, rim, and bearings - it came out a good bit better.

I found myself having trouble getting the wheels to load with compound.  The kit came with large sticks, about 2 pounds each, in several grits.  I tried using the black, brown, and white.  My inability to get it to load well may have something to do with the temperatures.  I think it was in the mid 20's most of the day and may have been up to 35 at the most in the building I was in.

As for the rest of the kit, it also came with 4 progressively softer grades of wheels in 8" diameter (2 of each grade) and the same again in 4".  It also came with the thing to condition the wheels.  They had it on sale (buffer, wheels, compounds) for just under $200 plush shipping ($40 to my place, the 2 packages weighted 78 pounds - its a hell of a buffer) up until the end of the year, now its back up to about $350 but I imagine it will drop down again.  I think it was worth the money if anyone is looking at one. 
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