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Old 10-14-2011, 05:39 PM   #1
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Sand Paper before polishing?

Hello everyone.
We saw this many times on the truck stops:
The guys polishing the fuel tank and rims on the tractor trailers using Sand Paper 400 and then 800. After that going to the bars Brown and white.
Results were amazing.
Wondering what is the sandpaper for? Those parts mentioned have clear coats as well? and if so. Will the sand paper has to be applied after removing the clear coat in the AS?
Please advise.
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Old 10-14-2011, 05:56 PM   #2
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Those rims are solid aluminum and not alclad - you have to be careful not to scratch through the outer pure aluminum layer on alclad

but .....

I had really bad corrosion on my endcaps and used fine sandpaper before I polished - because I had no choice ( it was that bad ) and it came out ok

I did use black/white bars to polish look at the links below VVVV
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Old 10-14-2011, 06:35 PM   #3
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Another thing is, tank trucks are constructed of various materials depending on what products they are hauling. Aluminum, Carbon Steel & Stainless Steel may all look like the Alclad aluminum of our Airstreams, but they are not the same.

Alclad is a trademark of Alcoa used to describe a corrosion resistant aluminium sheet formed from high-purity aluminium surface layers metallurgically bonded to high strength aluminium alloy core material. Alclad is a heat-treated aluminum, copper, manganese, magnesium alloy that has the corrosion resistance of pure metal at the surface and the strength of the strong alloy underneath. It's the same material that they use on airplanes - but not usually tanker trucks.

Another analogy is to compare a piece of "gold filled" jewelry to a piece of 14 or 18kt gold jewelry. Gold filled is a thin coating of gold layed over a base material (sometimes silver, sometimes a something else) where as 14kt gold is the same material through and through. The difference between 14, 18 or 24kt gold are the alloys - there is more pure gold (24kt) in the 18 and the 14 even though they are all "solid" rather than "gold filled".

Tanker trucks are not the "layered" sheet - they are the same alloy material through & through, so sanding it isn't a problem. If you sand through the thin layer of corrosion resistant aluminum in Alclad, it's still aluminum below but it is not as pure - it's a different alloy and so it will corrode (oxidize) at a different rate (faster) than the areas that still retain that top layer. Unfortunately, you can't see it happening as you are working an area, it'll show up as dark clouds a couple of days (weeks?) later - by then it's too late.

We too very lightly sanded some of the front road rash effected panels before polishing, but it was with 1000 grit wet-dry color coat paper with good results. The reason we did was to knock down the craters or pockmarks of the rock dings/road rash before polishing so the craters could be smoothed out - not to remove oxidation. Every little pebble that hits the front panel, creates a divot that when you go to polish, catches the buffing pad and compound.

Shari
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Old 10-14-2011, 06:58 PM   #4
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Jasco Removal

Quote:
Originally Posted by Darkspeed View Post
Those rims are solid aluminum and not alclad - you have to be careful not to scratch through the outer pure aluminum layer on alclad

but .....

I had really bad corrosion on my endcaps and used fine sandpaper before I polished - because I had no choice ( it was that bad ) and it came out ok

I did use black/white bars to polish look at the links below VVVV
Hello Darkspeed.
Thanks for the quick reply.
How many gallons of the Jasco did you need? Also do you recommend cover the windows and molding while applying the stripper or while rinsing ?
By the way we are also in wesley chapel. It will be great if we can stop by and take a look to learn a lot
Thanks again
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Old 10-14-2011, 07:03 PM   #5
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I just brushed around them and if it got on the glass i quickly removed it

Trick to the Jasco... Put it on count to 15 then start scrubbing the surface with your stripper brush ( natural fiber paintbrush ) and you will push up a gunky white residue like wall paper paste - this is your clear coat

If you put it on and walk off it will just flash and re harden

3 gallons

No problem - the trailer is actually in the lot directly behind advanced autoparts in Zypherhills - shoot me a message next week
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Old 12-29-2011, 09:29 PM   #6
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Wet.... 600,800,1200 and 6HB's.

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Old 12-29-2011, 09:47 PM   #7
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mmm

wow....that came out good.
We have a couple of place that may need that treatment.
Just wondering what is that compartment for?
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Old 12-29-2011, 10:03 PM   #8
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Quote:
Originally Posted by VeggieBullet View Post
wow....that came out good.
We have a couple of place that may need that treatment.
Just wondering what is that compartment for?

VB,
The front battery doorz on our Classic.
They are solid alloy, not the alclad thats used for the skin.
Took a bit of time but well worth the effort.
No polish used.
The final step was a glazing compound and Griot's Paint Sealer.

Bob
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