Honda CB750 Sandcast
The Restoration Shop => Lighting Systems and Chassis Electrical => Topic started by: markb on August 27, 2015, 02:38:12 pm
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Anyone have a good method for restoring the color to the RH control knob. I need to save this rare pointerless knob. It seems like there should be some kind of polish. I was even thinking of using a semi-gloss black paint.
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC01736.JPG)
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These are UV that are responsible for its state whitish... You can bring back it to its original appearance with polish for painting car and a soft tooth brush.. It is completely recoverable because mine was worse... (state same as that of the photo)... Here it is now on the second picture and it is not yet finished.
The polish is going to regenerate the surface by removing this fine whitish layer...
Johnson polish Renovator Special for car paint oxidized and tarnished.
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Your results look great! I tried googling "Johnson Polish Renovator Special" with no luck. Where can I find it?
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Mark,
Sincerely, I do not know because this product was purchased about 1985, at the time most of the paintings did not varnish and they are oxidized and tarnished by the sun.
Today this product has become completely obsolete because all cars paintings are varnished.
The brand Johnson is U.S... Why not try to contact them?
Gerard
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Mark I was browsing similar items and came across these on eBay surely they do the same job
141539344899
121419459739
These are the Ebay item numbers but in the UK, I would have thought they do something similar over in the U.S.
Thanks Garry :)
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Mark the Johnson polish as 4pots says is a very old product , but similar still available on the German Ebay site please see photo.
Garry :)
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Sorry missed two photos off.
Garry :)
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Check out item 221023919154
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This product seems similair to Johnson...
http://www.atmosse.fr/polish-professionnel-renovateur-peintures-anciennes-haut-de-gamme-1l-a455.html?gclid=CNDp7qPb0McCFcHnGwodzN0NQg (http://www.atmosse.fr/polish-professionnel-renovateur-peintures-anciennes-haut-de-gamme-1l-a455.html?gclid=CNDp7qPb0McCFcHnGwodzN0NQg)
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Thanks for all your help guys!
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The thanks is too much... A good restaurant will suffice!! ::) ::) :D :D ;)
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I'm guessing it would have to be Japanese. :D :D
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Not necessarily... I leave you the choice... :D ;)
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Here’s a product I found that is supposed to remove oxidation.
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC01741.JPG)
I made amazing progress in the first 5 minutes using a toothbrush. But ½ hour later it didn’t got any better. I think it’s still too grey. Would some plastic polish help?
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC01743.JPG)
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Anyone ever try black shoe polish? ???
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Mark, i have been following this thread while trying to remember what i used on my pointerless knob. i'm pretty certain i used Simichrome and a dense woven piece of flannel-like cloth. Simichrome is the classic German very fine grit aluminum polish, readily available in the US for at least 6 decades. as an aside, i've used Simichrome on the speedo/tach clear lenses with excellent results. on the lenses, i follow the Simichrome with Meguiar's clear plastic polish.
your knob appears to have some somewhat deep defects, at least on the top; probably degradation from some sustained exposure to uv rays, temperature extremes and moisture.
i don''t think these plastic products you are using are aggressive enough, especially applying with a toothbrush. i guess what i would suggest, i see no reason why you could not give a trial of 1500 grit paper; start on sides and see how the knob material responds. i am confident the material that knob is made of can be worked. or, if you have an old black knob you don't care about, experiment with fine and if necessary, coarser grits of paper.
i also have polished various types of plastic using fine rouge and a polishing wheel/pedestal motor. one MUST go lightly polishing plastics using a wheel, but the results are generally excellent.
i've known a couple fellows who've taken a new pointer type knob, removed the pointer with a mini-file and then shaped the remaining material atop the knob into the desired contour with the same file.
before and after pics of 232's knob. looks like mine may not have been as weathered as yours.
and..... the two outer dots are no longer red.... ! black like they were original. once in a while i do stupid things.......
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Here's the first clearer picture... There is the same micro cracks made by drying of UV that on your knob... The Brush a soft tooth with the Polish does not damage the surface of the knob but the contrary put highlight the surface defects.
I followed the advice of Steve by sanding the surface with sandpaper defects very fine with water but be careful not to round protrusions by sanding... Then I ironed the Polish with a soft cloth. Here is the new result on the second picture... The knob starts a have a very good head!
The knob to practically found its appearance and its hue of origin... Mark, (Many Thanks ;)) there is no reason that your knob does not follow the same path than that of Steve where mine... ;)
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Gerard, great field test results !
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Thanks Steve, just a note, I think do not mark in red the two outer points on the Kill Switch? ??? ???
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Gerard, you ARE correct ! I noted my mistake in my post about using 1200 grit paper.
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I said nothing.. Sorry...Sometimes unfortunately I do not understand everything...
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OK, sorry...Sometimes unfortunately I do not understand everything...
No problem ! I understand ! You do fantastic job with language !
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OK, how does this look?
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC01744.JPG)
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what did you use on the knob ?
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I do not see very well, but the button seems too matte, not smooth enough...
You do not have a picture with a different angle?
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How about this shot? I agree it should look a bit shinier.
At the risk of being scorned by half the site I’ll tell you what I did. After spending at least another 3 hours working on it (over 5 total) and not making any significant progress I shot it with a semi-gloss black paint. I had tried some other polishes and 2000 grit sandpaper at which point I noticed some distortion in the roundness of the knob looking at it from the top. I was able to touch that up but really didn’t want to risk making it look like it had been filed on.
I think it looks better than the picture and certainly passes the 6” test. Sorry, I realize it’s the purists solution.
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC01749.JPG)
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Mark, We are never ridiculous on the site.. ;)
So, if I understand correctly... There, it is painted in satin black. Quite honestly the result is not top... But good...
It is much better than at the start...
Personally, I will remove the paint at your place... How is the aspect under the paint?
Why is a grained appearance? It is the paint which made this grained appearance?
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The surface is not because of the paint but the paint might make it look worse. This knob was extremely weathered. If I sanded until it completely smooth maybe it would be black again. But as I said I was afraid of removing too much material and distorting the lines and edges. At some point the paint can always be removed just as one could try to sand it black so I figured nothing was lost. Maybe gloss paint would look better.
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Yes, in cases like that it was always a bit afraid to damage the part still more...
Because as they say "the better is the enemy of the good"...
Perhaps a primer special for the plastic before painting to fill imperfections??
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Do you have a pointer type knob you can modify ?
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I do have a couple and I thought of that too. I'm not sure I have the skills for that. I had enough trouble with the sandpaper. But I think I could find a die maker that could make quick work of it.
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I do not think that the painting is the solution to the problem because the knob is submitted a manipulation and early where later it will take to undo to remake a new painting.. Not good... >:( >:(
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I agree with Gerard.
Is the surface smooth ? If so, have you tried actual aluminum polish to bring out more of a shine? Simichrome is, imho, the best.
I would have no hesitation modifying a pointer knob. Do you have a spare ?
I sent you an email.
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Mark, I'm sure you can save this knob... Because the original knob will be better than a fake, and you will feel better to know that it is true... ::) ::)
We must think to find the correct method, even if it means leaving it aside a few days after returning with a real solution...
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I haven't tried this with a black kill switch knob but maybe worth a try. If you have a redundant knob then give it a go.
https://www.youtube.com/watch?v=M7vS6F8EHxI (https://www.youtube.com/watch?v=M7vS6F8EHxI)