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Posted this on VJMC site ... maybe someone will share knowledge with us !

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AshimotoK0:
"Anyone know a technique for reproducing the clear coat 'brushed' alloy finish, particularly on fork legs. The best I have seen is on the 'Vic World' CB750 sandcast rebuilds (one of which is in the Honda Museum in Japan). I read a VJMC article a few years back about sanding with different grades of abrasive paper and sanding 'with the grain' on the alloy. Vic Worlds technique is 'listed' in this photo but no real detail. 'World 1) strips the clear coat then 2) they are bead blasted, 3) rough polished cleaned with solvent, 4) dipped into an ultrasonic bath, 5) Acid bath so that paint will 'stick' 6) Dried 7) Painted with a special clear coat. Its 3) the rough polishing that I need to master plus I can only assume the 'Acid' described is Chromic acid (as in 'Alodyne 1000 series) use in the aerospace industry, active ingredients Chromic acid < 0.5 % and Zirconium potassium fluoride < 0.5 % ). I wonder if the 'special' clear coat he uses is something like 'Eastwood Diamond Clear'. Please don't remind me about the health hazards involved... as I am fully aware. BUT I hate highly polished alloy on Honda's IMHO it just doesn't look right. I have heard of people using a Scotchbrite 'satinizer' wheel to recreate the brushed finish. Problem on fork legs are the protrusions for caliper mounts/mudguards 'fenders' etc. Even thought of mounting the leg in my lathe but powering the drive from a separate stepper motor so that in the 'protrusion' areas it will only rock in a pre-programmed arc. I have 8 Honda's in various stages of restoration so I have 16 fork legs to refinish. Hence, I need to definitely automate this process somehow.
Why can't the 'Classic' mags include stuff like this instead of the same old tosh that they they expect us to stump up our hard earned cash for every month?"



http://www.worldmotorcycles.com/Pages/MC-Retro-Article.html



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Johnwebley:


  thanks for posting this,and the link,it goes to show the depth of detail ,and how carefully he does the re-build,not over restoring ,

 it would be great to live in Arizona,or Southern California with the dry atmosphere and little,if any salt on the roads

Nurse Julie:
I am just being taught the fine art of polishing cast alloy casings etc on bikes to show standard. Now, I know about polishing 'with the grain' on wood but, as hard as I look at this alloy side casing, I can't find the damned grain anywhere, where do I look???

mike the bike:
That thought occurred to me too

UK Pete:
I dont think ally has a grain, it is usually wise to polish in the direction that the factory polished in so a sort of man made grain ,if you get what i meen
pete

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