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Old 06-10-2013, 08:34 AM   #1
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Do not attempt to polish diamond plate

Just a word of warning- Washed the Camper this weekend and attempted to remove some stubborn bug guts on the diamond plate rock guard on my Coachmen with a metal polish....Guess this really is not a true diamond plate rather a thin sheet of i would assume aluminum over plastic?? Anyhow the polish scratched it all to hell and i ended up going ahead and "Polishing" the entire panel. Now I have a Brushed aluminium Rock guard.
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Old 06-10-2013, 08:58 AM   #2
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Sorry to hear about it.
Any chance a cloth buffing wheel and rouge will get it back shiny?
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Old 06-10-2013, 09:00 AM   #3
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Possibly....If anything it might make the "haze" a bit more uniform.
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Old 06-10-2013, 09:10 PM   #4
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I waxed my camper and Diamond plate with no issues. Maybe its something in the polish you have?
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Old 07-20-2013, 11:48 PM   #5
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What polish was it ?
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Old 07-21-2013, 12:01 AM   #6
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Try mothers alum polish. Its a lot of work but worth it.

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Old 07-22-2013, 12:21 PM   #7
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I used a SS polish i used to use for cleaning exhaust tips on motorcycles and such. Looking back it was a bit abrasive. I am going to wax it and see if it brings back the luster.
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Old 07-25-2013, 08:30 PM   #8
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Once you polished the area did the area you polished look as if the bright diamond plate had come off and underneath that there was either a white-ish or black-ish looking surface? IF so--then you may indeed have an aluminum coated plastic sheet. There are coatings for plastic that will appear as nice as new chrome, and there are so-called "polished Diamond Plate" sheets out there. One way to tell for sure is to take a paper clip, straighten it out, heat one end of it up really hot and stick it straight into the material. If it appears to melt a hole into the material then is is plastic. Of course if nothing happens then it may indeed be a metal plate. This surface could even be black sheet metal diamond plate which has had an aluminum powder coat applied and polished well.
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Old 08-23-2013, 05:56 PM   #9
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It can be polished if it is indeed aluminum. I would recommend a product called Flitz, it is the best I've found in 28 years of polishing the aluminum on my rig. Second choice would be Zephyr 40. If your really gung ho and want a mirror finish use a 5000 rpm angle grinder and a yellow buffing wheel with red bar of rouge as a start and finish with a white wheel with the green bar of rouge.
These will all work providing your diamond plate isn't "protected" with some kind of sealer.
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Old 08-23-2013, 05:59 PM   #10
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our current trailer does not have diamond plate, but our last one did. The diamond plate had been sprayed with a coat of clear coat.

Even if the aluminum coat is thin, it seems unlikely you could have worked through it by hand.
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