The Baggie test marred my paint

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Bill220

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Anyone else experience this?

I've been meticulous in how I wash my car and it has paid off. 6 months and no swirls/marring except in a few small areas.

In the process of cleaning the paint to reapply sealant I felt the paint with my bare hand it was smooth as can be. I then used the baggie test on a small area of the roof and hood and discovered that it had marred the paint in those areas. I ended up polishing the hood, roof and trunk lid with M205 and a white pad to remove them.

I won't be using that test on my paint again.


Anti chrome
 
Hum... only way I can think it could marre the paint is if the bag is dirty or the paint is dirty. If both are clean, plastic should not have any roughness to it with the amount of pressure needed to do the baggie test (pretty much no pressure at all).
 
I would think after a good wash, any contaminants still stuck to the paint at that point aren't going to be that easily dislodged by just doing a baggie test to inspect-feel the paint.

If I remember correctly, the last time I bought the Clay Magic Clay Bar, it even came with a plastic Glove in the Box, and this Glove was ultra ultra thin plastic.

Are you absolutely sure it was marring-scratching, and not perhaps "smearing" of a tree sap maybe?

This then sounds like some very soft paint if this is happening.
 
Almost every time I have performed a "baggie test" the car was so swirled out to a ridiculous point that you wouldn't be able to tell if the plastic was marring the paint or not.

For a fully corrected vehicle that is well maintained I see no need, nor would I recommend, performing a baggie test to check for contamination. And yes, I have experienced marring from a plastic ZipLock bag on 100% clean paint. It was so very slight you could only see it at just the right angle but it happens.
 
I use the cheap thin plastic sandwich baggies. No problems as of yet.

Sent from my SAMSUNG-SGH-I777 using AG Online
 
It shouldn't mar the paint unless your pushing hard when doing it. All you have to do is lightly touch the paint with the bag to feel the dirt. I have never marred paint when doing it.
 
Bill220 said:
6 months and no swirls/marring except in a few small areas.

I then used the baggie test on a small area of the roof and hood and discovered that it had marred the paint in those areas.

^^^Not the same "areas", I'll presume.^^^
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Also:
You didn't say if you discovered any embedded-contaminates, or not...via "the baggie test".

Bob
 
I have never used that test. It has always been easier to feel for contamination for me simply running my fingers over it.
 
You are checking for above surface contaminates , not sanding a painted surface. A light touch is all that is needed for the test. Been doing this since 2005 and never seen it marr a surface. The thinner the bag the better. The clear wrapper from a pack of smokes will also work in a pinch.
 
goodinblack said:
I have never used that test. It has always been easier to feel for contamination for me simply running my fingers over it.
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It can feel butter smooth with your fingers, but feel like sand paper once you put on the baggy.
 
goodinblack said:
I have never used that test. It has always been easier to feel for contamination for me simply running my fingers over it.

^^^Glad this method works for you!^^^ :props:
Click to expand...

What determines the: "Accuracy" Of Human Sensory Perception

-Every Human has limits (can only run so fast, jump so high, go just so long without water)...
And those limitations, IMHO...include restrictions upon a Human's five senses.

In this scenario: Touch:

What are the mechanoreceptors that allow: "The Sense of Touch"; and which one(s) of those receptors would be
more responsible for sensing "texture"---as postulated by/when performing "the baggie test"?
[I find myself to lean towards the Pacinian/lamellar corpuscles (receptors)]

Of course...
How these touch-sensations are relayed to the Human brain, and interpreted therein, play a significant perception-role.


Then there are those that are afflicted with neuropathy/paresthesia (count me, in that group):
What chance do they stand of 'feeling' any claying-worthy contaminates, without the necessary amplification
that's noted to be provided by, and through, said: "Baggie testing"-protocol?!?!

:)

Bob
 
Calendyr said:
Hum... only way I can think it could marre the paint is if the bag is dirty or the paint is dirty. If both are clean, plastic should not have any roughness to it with the amount of pressure needed to do the baggie test (pretty much no pressure at all).
Click to expand...

I think I pushed down too hard. The marring came right out with a light buff of M205

MarkD51 said:
I would think after a good wash, any contaminants still stuck to the paint at that point aren't going to be that easily dislodged by just doing a baggie test to inspect-feel the paint.

If I remember correctly, the last time I bought the Clay Magic Clay Bar, it even came with a plastic Glove in the Box, and this Glove was ultra ultra thin plastic.

Are you absolutely sure it was marring-scratching, and not perhaps "smearing" of a tree sap maybe?

This then sounds like some very soft paint if this is happening.
Click to expand...

The car is garaged, driven maybe a couple of times a week and I'm obsessive about keeping it clean. With my hand, I felt no roughness, which prompted me to use a baggie.

Nicholas@Autowerx said:
Almost every time I have performed a "baggie test" the car was so swirled out to a ridiculous point that you wouldn't be able to tell if the plastic was marring the paint or not.

For a fully corrected vehicle that is well maintained I see no need, nor would I recommend, performing a baggie test to check for contamination. And yes, I have experienced marring from a plastic ZipLock bag on 100% clean paint. It was so very slight you could only see it at just the right angle but it happens.
Click to expand...

Yep, live and learn.

hernandez.art13 said:
What color is your vehicle Bill220?
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ken tuep said:
I use the cheap thin plastic sandwich baggies. No problems as of yet.

Sent from my SAMSUNG-SGH-I777 using AG Online
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I used Walmart baggies.

Pureshine said:
It shouldn't mar the paint unless your pushing hard when doing it. All you have to do is lightly touch the paint with the bag to feel the dirt. I have never marred paint when doing it.
Click to expand...

FUNX725 said:
Also:
You didn't say if you discovered any embedded-contaminates, or not...via "the baggie test".

Bob
Click to expand...

I did not. Sorry about that. Smooth as a baby's butt.

goodinblack said:
I have never used that test. It has always been easier to feel for contamination for me simply running my fingers over it.
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Yeah, next time I will do that.
 
Bill220 said:
It's Dark Highland Green and it's EXTREMELY
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OK...I'll take a guess:

"and it's EXTREMELY"...green as some babies' butts?
ack.gif


Sorry about that!

:D

Bob
 
Bill220 said:
It's Dark Highland Green and it's EXTREMELY

Click to expand...

Yeah I suspected it was a darker color. I tried the baggie test on a black car and it marred it. I also tried it on a lighter colored car. And zero marring.

I see AG videos and if I remember correctly. They do baggie test on all color paints. Including black paint. So it probably comes down to technique. I learned about the baggie test through AG. So i'm still a newb in that aspect.

:)
 
Wow...... Sorry guys.

I never knew I would get so beat up over my remark. LOL

Carry on with the baggie test then fellas.

:)
 
It will do that on soft paint. Spray a little clay lube on the surface then run your baggie across. Problem solved.
 
goodinblack said:
Wow...... Sorry guys.

I never knew I would get so beat up over my remark. LOL

Carry on with the baggie test then fellas.

:)
Click to expand...

Well you did say the following (emphasis added):

"I have never used that test. It has always been easier to feel for contamination for me simply running my fingers over it."

The obvious question is how could you know it doesn't have value if you've never tried it? As Bob alluded to, unless you have superhuman finger sensitivity, the baggie amplifies the contaminants so you can feel their presence.

What you can't feel with bare fingers you can feel with the aid of a thin layer of plastic. In fact the baggie test was patented, but not likely enforceable, and the patent was expired due to non-payment of dues some years back.

Anyways...it's worth a try since you've not tried it. I also don't think anyone intended to be abusive and was just replying to your comment with matter-of-fact info.

To the OP: One person suggested there could have been a film on the baggie (even fresh out of the packaging) or on the vehicle. that was smeared, which could look like marring but not actually affecting the paint. That seems plausible too.
 
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