Zach McGovern
07-24-2014, 01:15 PM
What is Micro-Marring?
Micromarring/DA haze is the name given to the fine defects left behind after cutting or compounding. These defects are created because the heavy cutting pad combined with a cutting compound is often not capable of finishing down perfectly, and therefore leaves behind these very fine scratches which appear as 'tick marks' and are referred to as micromarring.
This type of defect is often easy to see on dark paint, especially non-metallic paint. In the following photo you will notice that the right side has not been corrected, and the left side has been improved considerably, however the surface finish is not so great. What you see on the left side is the marring left from the compounding phase. Again, this is very easy to see on this jet black paint.
https://scontent-b-ord.xx.fbcdn.net/hphotos-xpa1/t1.0-9/1016410_357295094408616_1968254789_n.jpg
If you've ever worked on a light colored vehicle, you've probably noticed that it will often appear to be nearly perfect after a heavy compounding step. This can also be the case when working on highly metallic paint (especially lighter colors).
While this is certainly possible that some paints will finish down perfectly after heavy compounding, the truth is that many people simply don't know how to spot marring/haze on lighter colors or on metallic paint as these colors are much more forgiving.
This 50/50 shot shows what appears to be a perfectly finished corrected side after just compounding with a MF cutting pad and a cutting compound. Looks great, right?
https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-xpa1/t1.0-9/1549549_422349657903159_310688671199953973_n.jpg
So right about now you're thinking "Awesome! Less work for me... Heavy cutting and perfect finishing all in one step"... but maybe we should take a better look with a different light source...
In the following photo you will notice the left side of the section is darker and clearer than the right. The left side has been finished with a fine finishing polish. View the image at full resolution and take a look at the reflection of the window towards the top of the photo, even without the direct lighting from the flashlight, you can tell that the reflection of the window in the background is much more crisp on the side that has been properly finished.
https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xpf1/t1.0-9/10544378_422349747903150_5650616973182939402_n.jpg
A closer look at the same section shows that while the right side is certainly in great shape after compounding, there is no denying the fact that the left side is more refined.
https://fbcdn-sphotos-f-a.akamaihd.net/hphotos-ak-xpa1/t1.0-9/1551684_422349737903151_4166833678087693757_n.jpg
How to Check for Marring
On lighter colors, especially light colored metallic paint, I have found the best way to check for marring is with a small LED flashlight. I use a Coast HP7 simply because it was available locally. This light is a 251 lumen light that is zoomable so you can change between a flood light and a spot light (this feature is important!). It can take a bit of experimenting to find the best conditions to spot marring on paint like this. You can alter the angle of light output (zoom), physical distance of the light to the panel, etc. to find something that works best for each particular scenario.
In the following video, you'll notice there are visible 'streaks' or light trails towards the right of the panel, and they are completely gone as I pan towards the left. These light trails are a dead giveaway that the surface is not finished properly. This particular panel was compounded and then wiped down with Eraser to be 100% sure that I was not just seeing streaks from compound oils, but I was looking at the true condition of the finish. The right side was then polished to remove the marring.
https://www.youtube.com/watch?v=WDNdimI4bo8
It is important to note that the marring was not evident with any other light source that I used for inspection. These include halogen work lights, my DIY LED Lights, and the sun. The reason is that all of these light sources are simply too powerful to highlight such a fine defect on brighter/lighter paints. Most people's eyes simply can't detect it. This is why the smaller LED light seems to work the best (at least for me).
So I suppose the real moral of the story is this... check your work with many different kinds of lights, and it never hurts to do a test spot with a finer polish even if you think the paint looks great after cutting. After all, the time required for a final finishing step is definitely worthwhile when you are seeking a true mirror like finish.
https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-xfa1/t1.0-9/10565238_422350311236427_4355323361253643183_n.jpg
Hope this helps!
-Zach
Micromarring/DA haze is the name given to the fine defects left behind after cutting or compounding. These defects are created because the heavy cutting pad combined with a cutting compound is often not capable of finishing down perfectly, and therefore leaves behind these very fine scratches which appear as 'tick marks' and are referred to as micromarring.
This type of defect is often easy to see on dark paint, especially non-metallic paint. In the following photo you will notice that the right side has not been corrected, and the left side has been improved considerably, however the surface finish is not so great. What you see on the left side is the marring left from the compounding phase. Again, this is very easy to see on this jet black paint.
https://scontent-b-ord.xx.fbcdn.net/hphotos-xpa1/t1.0-9/1016410_357295094408616_1968254789_n.jpg
If you've ever worked on a light colored vehicle, you've probably noticed that it will often appear to be nearly perfect after a heavy compounding step. This can also be the case when working on highly metallic paint (especially lighter colors).
While this is certainly possible that some paints will finish down perfectly after heavy compounding, the truth is that many people simply don't know how to spot marring/haze on lighter colors or on metallic paint as these colors are much more forgiving.
This 50/50 shot shows what appears to be a perfectly finished corrected side after just compounding with a MF cutting pad and a cutting compound. Looks great, right?
https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-xpa1/t1.0-9/1549549_422349657903159_310688671199953973_n.jpg
So right about now you're thinking "Awesome! Less work for me... Heavy cutting and perfect finishing all in one step"... but maybe we should take a better look with a different light source...
In the following photo you will notice the left side of the section is darker and clearer than the right. The left side has been finished with a fine finishing polish. View the image at full resolution and take a look at the reflection of the window towards the top of the photo, even without the direct lighting from the flashlight, you can tell that the reflection of the window in the background is much more crisp on the side that has been properly finished.
https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xpf1/t1.0-9/10544378_422349747903150_5650616973182939402_n.jpg
A closer look at the same section shows that while the right side is certainly in great shape after compounding, there is no denying the fact that the left side is more refined.
https://fbcdn-sphotos-f-a.akamaihd.net/hphotos-ak-xpa1/t1.0-9/1551684_422349737903151_4166833678087693757_n.jpg
How to Check for Marring
On lighter colors, especially light colored metallic paint, I have found the best way to check for marring is with a small LED flashlight. I use a Coast HP7 simply because it was available locally. This light is a 251 lumen light that is zoomable so you can change between a flood light and a spot light (this feature is important!). It can take a bit of experimenting to find the best conditions to spot marring on paint like this. You can alter the angle of light output (zoom), physical distance of the light to the panel, etc. to find something that works best for each particular scenario.
In the following video, you'll notice there are visible 'streaks' or light trails towards the right of the panel, and they are completely gone as I pan towards the left. These light trails are a dead giveaway that the surface is not finished properly. This particular panel was compounded and then wiped down with Eraser to be 100% sure that I was not just seeing streaks from compound oils, but I was looking at the true condition of the finish. The right side was then polished to remove the marring.
https://www.youtube.com/watch?v=WDNdimI4bo8
It is important to note that the marring was not evident with any other light source that I used for inspection. These include halogen work lights, my DIY LED Lights, and the sun. The reason is that all of these light sources are simply too powerful to highlight such a fine defect on brighter/lighter paints. Most people's eyes simply can't detect it. This is why the smaller LED light seems to work the best (at least for me).
So I suppose the real moral of the story is this... check your work with many different kinds of lights, and it never hurts to do a test spot with a finer polish even if you think the paint looks great after cutting. After all, the time required for a final finishing step is definitely worthwhile when you are seeking a true mirror like finish.
https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-xfa1/t1.0-9/10565238_422350311236427_4355323361253643183_n.jpg
Hope this helps!
-Zach