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Old 04-24-2015, 07:42 PM   #1
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Question Cracks in paint has got me confused.

I have a 2003 McKenzie (Monaco) Rogue. I believe it has painted aluminum siding. I just purchased it over the winter. I am trying to figure out what's going on in the attached pictures. There are spots where it looks like someone started to polish the surface and then stopped. It appears there may be oxidation which someone tried to buff out.
You will see in the first picture on the left an area which looks whiter. On the left side of the picture, you'll see what the majority of the surface of the RV looks like (oxidation?). The picture on the right is a close-up of the area which shows cracking in the paint. In the area that looks like it was polished or cleaned, the paint has cracks in it. I am trying to figure out what to do next. I'm not sure if I should just polish the entire RV and then protect with a good wax. Should I be concerned about the cracks in the paint? The RV was kept inside by the previous owner.
Thanks.
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Old 04-24-2015, 07:56 PM   #2
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After years of the suns UV rays and severe heat, decals and Paint will crack and fracture like an old painting on wood, steel, aluminum and fiberglass. The color Black is the worse offender and RV Manufactures know this and yet still choose to make it a primary color on their coaches.
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Old 04-25-2015, 10:18 AM   #3
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That certainly looks like plain old paint aging/cracking. It may eventually flake off, but that is not a given either. As long as the surface prep was good and the paint well-adhered, the cracks won't lead to flaking.

The downside is there is nothing to be done about it. The paint is hard & brittle, so it cracks when the metal skin flexes due to heat expansion, road vibration, etc.

As for the discoloration, try polishing with a product that has some grit to it, usually those labeled "restores color" or "removes oxidation". If the discoloration is in the surface of the paint, that will help. If it goes all the way though, it won't.

Any "wax" will help protect the painted surface from further deterioration and give it a bit of shine.
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Old 05-30-2015, 07:21 AM   #4
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do you hand polish or use an orbital type polisher?


  1. Quote:
    Originally Posted by Gary RVRoamer View Post
    That certainly looks like plain old paint aging/cracking. It may eventually flake off, but that is not a given either. As long as the surface prep was good and the paint well-adhered, the cracks won't lead to flaking.
Quote:
Originally Posted by Gary RVRoamer View Post
The downside is there is nothing to be done about it. The paint is hard & brittle, so it cracks when the metal skin flexes due to heat expansion, road vibration, etc.

As for the discoloration, try polishing with a product that has some grit to it, usually those labeled "restores color" or "removes oxidation". If the discoloration is in the surface of the paint, that will help. If it goes all the way though, it won't.

Any "wax" will help protect the painted surface from further deterioration and give it a bit of shine.
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Old 05-30-2015, 06:22 PM   #5
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Are you asking how I do my own coach, or how I would handle this one? I hand polish mine (fiberglass with full body paint) with Protect-All. I would probably do the same with the OP's MacKenzie Rogue. There is no advantage to machine polishing unless the surface is oxidized.
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