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Old 01-28-02, 01:45   #1 (permalink)
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Questions about lighing-sunlight vs Flourescent>

Okok

I got the SS out for the first time in a while becouse of the nice weather that we are having I noticed that I have marks on the hood it direct sunlight that I dont have in the garage under Flourescent lights? I dont think that they are swirls? But they sort of look like them, just right around where the reflection of the sun is...... what could that be from? or is it just the way the light its from direct sunlight??

Again they are not there under the garage lights.......
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Old 01-28-02, 02:02   #2 (permalink)
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Do you have a carnuba topper on your car?

eom
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Old 01-28-02, 02:05   #3 (permalink)
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DK- no
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Old 01-28-02, 02:40   #4 (permalink)
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Different spectrum in the light sources...Plus the sun is pretty bright. Try getting some Halogens and see what you see.

They could be swirls that are very fine and the sun's light rays being very indirect reflected of the edges a bit more than the Flours. in the garage?

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Old 01-28-02, 02:44   #5 (permalink)
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Man, doesn't that just fry you?

All I can say is that no matter WHAT light you use, you will see stuff in another light that you didn't catch before. I can wax my car inside, but I always find a spot i didn't buff when I back it out into the light, and at that, I usually discover a few others day or two later.

The best lighting for showing flaws, for me, is in the warehouse where I park one of my cars. Typical wood structure, very high ceilings - probably 35 feet. There are a few skylights up there. The light is not real bright, and somewhat diffuse. I see EVERYTHING - at least on the top surfaces. Sometimes this really irritates me - I might have just detailed the car at home and I've patted myself on the back for how great it looks. Then I roll it in there......

If we have any optical physics experts out there, I'd love to know more about why some lighting conditions show swirls better than others.
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Old 01-28-02, 03:12   #6 (permalink)
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glad to hear that am not the only one
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Old 01-28-02, 03:54   #7 (permalink)
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Perhaps it is spiderwebbing in the paint?

If this is the case, there is not much you can do.....
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Old 01-29-02, 05:01   #8 (permalink)
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Doh, thats going to make me look like a fool. I am running around like a chicken without a head telling everyone to look at their car when they fill up thier tank to see swirls or any other paint defects. I always see more than I ever could under lights at a gas station. Around here the gas stations are re-built every so many years so maybe they get better lights as they re-build.

They are around 20 feet high if that makes a difference.

Nice to know you had your camaro out for a spin, I was reading some Camaro tribute in a magazine yesterday, really interesting. First year they were produced, over 220,000 were sold. Anyhow, hope you enjoyed your spin.
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Old 01-29-02, 09:22   #9 (permalink)
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Hi guys,
This is my first post, though I have been lurking and reading for quite some time. In response to the question of why sunlight reveals more swirls than fluorescent lighting, it is because sunlight is essentially a point-source. The degree to which swirls are visible depends on the angular size of this point source. You're far away from the Sun so the angular size of the sun is a small angle. In this case, you can reflect sunlight rather than absorb it into a narrow angle (such as a swirl mark). With fluorescent lighting suspended only a few feet above the paint surface, the angluar size is huge, and the light is not reflected but rather absorbed by the swirls. Halogen and incandescent lights more closely resemble point sources. Even better than that is some sort of HID light source such as HPS or Metal Halide (parking lot lighting). Under HID lighting, swirls can be easily seen.
OK, that's enough of that. Now I have a question. Just took delivery of my black car last month and the dealer swirled the hell out of it in delivery prep. Just received my Z6,ZFX, and Z5 shipment. Should that do the trick?


TIA,


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Old 01-29-02, 09:50   #10 (permalink)
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Welcome to the club!

Sweet Car!

How bad are the swirls? Can you see them as clear as day or do you have to bend yourself at wierd angles in certain light to see them?

If the swirls are moderate (like the ones on my BMW that my dealer made!), I would remove them first before starting the zaino process. Once you start zainoing, you never need to strip and start over, so if you don't address them not they will come back to haunt you later on. I suggest using something mild first by hand like 3M SMR (#39009) for dark colored cars. You can finish up any hazing it leaves with something VERY mild like PPCL or go right to Z5.

If the swirls are minor, mulitple coats of Z5 should do the trick. I would dawn wash, clay, and then ZFX with Z5.

Either way your new black volvo will look awesome! Post pics!
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Old 01-29-02, 10:03   #11 (permalink)
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Welcome!! great insight into point source lighting.

I would remove the swirls first with some abrasive as they would drive me nutts!!!!

DK had some great advice as well.

Happy Mardi Gras!!
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Old 01-29-02, 10:14   #12 (permalink)
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DetailKing-

The swirls are not that bad. Really only visible in sunlight, but they are all over. I am hesitant to use an abrasive on such a new finish, so I figured that the ZFX/Z5 would fill/hide the swirls until I am ready to do an abrasive treatment of the entire car. It's my understanding that SMR is a relatively mild abrasive, so if a few coats of z5 does not do the trick, then I may try that. Have you had any luck applying SMR by hand, or does it really only work with a PC orb? When I took delivery of the car, it was early evening, so I did not notice the swirls. Imagine my surprise the next morning. The dealership tried to remove them with little success. I should have figured that since their best hands put them there in the first place. Actually, it looks like they used a rotary buffer. Oh well, guess if you want to do it right, then you have to do it yourself. I'm planning on spending a day with my new, surprisingly pleasant smelling Z friends this weekend. I'll be sure to post some pics.


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