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Old 07-27-2005, 11:55 PM   #1
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Polishing shadows??

I am polishing my 74 Tradewind and I have run into a problem. I am compounding with Nuvite C then Cycloing with Nuvite C then Cycloing with Nuvite S. All the surfaces are very shinny but I am finding gray or dark vertical shadows in some areas. I have redone them and they are still dark. They are glossy when viewed from directly in front but when you view the trailer from in front or in back at a long angle the vertical shadows are apparent. Can anyone weight in on this? Thank You
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Old 07-28-2005, 04:52 AM   #2
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Quote:
Originally Posted by Bradjun1
I am polishing my 74 Tradewind and I have run into a problem. I am compounding with Nuvite C then Cycloing with Nuvite C then Cycloing with Nuvite S. All the surfaces are very shinny but I am finding gray or dark vertical shadows in some areas. I have redone them and they are still dark. They are glossy when viewed from directly in front but when you view the trailer from in front or in back at a long angle the vertical shadows are apparent. Can anyone weight in on this? Thank You
Are you certain that all the clear coating is off the aluminum. I noticed a few spots on mine when I polished (bout the size of a quarter)that needed to have the clear removed.... But your problem does not reall sound like that. Can you upload a picture???
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Old 07-28-2005, 07:05 AM   #3
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Acid bath

I think you will need to research appying a very diluted acid bath before your final polishing cycle.

I have heard and seen this symptom a few times. The way to get rid of the shadows is by washing the AS with this diluted acid bath. It will haze the aluminum again but when you polish the next time it will "POP" as in shine like a mirror.

maybe need to search acid bath.

You may find mixed opinions on this acid bath but I have seen the results and there is no comparison between a polished to the max trailer with no acid bath and one that was acid bathed between polishing cycles.
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Old 07-28-2005, 08:38 AM   #4
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Balrgn,
The shadows don't appear in a picture but I am certain that they are not unremoved clearcoat. I'm thinking that they are a residue left from the Nuvite during the compounding . I am going to compond once more and really made sure everything comes off. If this doesn't work I be back with more questions. By the way I have followed the progress on your Tradewind and it looks like great work.
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Old 07-28-2005, 08:42 AM   #5
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smily,
Thanks for the feedback. Can you direct me to an acid that you are farmilar with? I have read some threads on this and I might want to experiment with it. Thank You
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Old 07-28-2005, 08:45 AM   #6
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Not to be a pessimist, but...

An acid bath may not help...if one of the following has occured:
  • Could you have compounded at too high of a speed, generating enough heat, burning the aluminum?
  • Could you have polished through the Alclad layer exposing the lesser quality aluminum below?
Both of these would result in darker grey aluminum streaks or splotches. A tell tale way of knowing is, if the gray areas seem to get bigger the more you work on them.

We have an area about 1-1/2"x2" on one of our compartment doors where we burned through the alclad trying to get a scratch out. It's very tough to photo but is very visable in real life...the only way to 'fix it' is to replace the panel/door.

Shari
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Old 07-28-2005, 08:49 AM   #7
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Quote:
Originally Posted by Bradjun1
Balrgn,
The shadows don't appear in a picture but I am certain that they are not unremoved clearcoat. I'm thinking that they are a residue left from the Nuvite during the compounding . I am going to compond once more and really made sure everything comes off. If this doesn't work I be back with more questions. By the way I have followed the progress on your Tradewind and it looks like great work.
Thanks, I ended up cleaning the compound residue (black) with liquid car wax. I''ll be doing a touch up polish tomorrow, now the weather here has cooled a bit! If it isn't raining it too hot to work outside!
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Old 07-28-2005, 09:12 AM   #8
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Insideout,
I compounded at a very slow speed and applied very little pressure so I don't feel like I burned the surface or went through the Alclad. I am going to try a good cleaning and another attempt a compounding on a test spot and I'll report my findings. Thanks for the input.
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Old 07-28-2005, 12:30 PM   #9
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Good...

Quote:
Originally Posted by Bradjun1
Insideout,
I compounded at a very slow speed and applied very little pressure so I don't feel like I burned the surface or went through the Alclad. I am going to try a good cleaning and another attempt a compounding on a test spot and I'll report my findings. Thanks for the input.
I hope the acid bath/cleaning works for you...we were VERY dissappointed to notice the burn spot on ours ~

Shari
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Old 07-28-2005, 02:42 PM   #10
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Bigshinything

As far as Acid bathing, Maybe you could PM "BIGSHINYTHING". He is well versed in the process and maybe willing to share his insight.
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Old 07-31-2005, 09:04 PM   #11
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When I owned Balrgn's trailer I made a very poor start on the polishing. there were black shadows. An expert at a polishing demo told me it was clear coat that was not removed. The description you give is exactly what I had. I suggest you start at the begining and strip that area again.
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