Wow.

AAE

AAE

Learner
I was blown away when then guide coat revealed these finger tracks on this day old clear. I had used a 600 disc with a scrub pad backing. So many straight lines.


PXL_20240127_150059097.jpg
 
Chris_Hamilton said:
Or that the guidecoat is repelling for some reason in those areas. Oils on your skin etc. I would think that is a more logical explanation. IDK. Did you try cleaning the panel with W&G remover then reapplying? Trying to understand how hand/finger prints can cause low spots.
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My thoughts are that the pad contoured to my fingers and created "low spots". But, you could be on target with it being body oil. In that case, I think I should shower more than just Wednesday and Saturday.
 
AAE said:
My thoughts are that the pad contoured to my fingers and created "low spots". But, you could be on target with it being body oil. In that case, I think I should shower more than just Wednesday and Saturday.
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If it was from the extra pressure from your fingers in those areas while pad sanding, the edges would be much softer. I too think Chris is on the right track.
 
I do too. I've had a plethora of issues lately and just thought this might have just been another straw.
 
I was always warned about hand sanding without at least a soft pad when I was just getting in the game over 20 years ago. At least sanding with fair pressure with your fingers. I’ve never really paid too much attention to it or really noticed it. But I guess I tend to atleast use a soft foam block or if using scuff pads not really using lots of pressure on my finger tips. Well, except nooks and crannies where it doesn’t really matter, core supports, etc. This is the first time I’ve ever really seen it highlighted. The guide coat really shines a light on it. I’m going to assume you couldn’t really notice it before the guide coat?
 
Whitesnake said:
I was always warned about hand sanding without at least a soft pad when I was just getting in the game over 20 years ago. At least sanding with fair pressure with your fingers. I’ve never really paid too much attention to it or really noticed it. But I guess I tend to atleast use a soft foam block or if using scuff pads not really using lots of pressure on my finger tips. Well, except nooks and crannies where it doesn’t really matter, core supports, etc. This is the first time I’ve ever really seen it highlighted. The guide coat really shines a light on it. I’m going to assume you couldn’t really notice it before the guide coat?
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Didn't have a clue. After Chris mentioned it, I did realize that I had run my hand over it all to feel the 10,000 nibs in it. But, I have seen the finger trails when scuffing too.
 
This is exactly why I use a hard sanding block for the initial sanding of the clear. All subsequent steps I use a soft block.
Had a pro tell me years ago the dangers of finger pressure and learned the hard way that he was right.
 
that dry guide coat does that all the time. chris was right, you can have something on your hand or i have even seen static do it when the powder is repelled in certain areas. dont worry about how it goes on. that doesnt tell you anything. when you put a block on it and sand that guidecoat off...thats when the real irregularities will show.
 
Chris_Hamilton said:
Trying to understand how hand/finger prints cause low spots.
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Your hand isn’t perfectly flat and all the pressure is on the bottoms of your fingers, which sand grooves. I see this all the time if I’m wet sanding and not careful. Not saying that’s what this is.
 
True Blox used to sell a wet sanding block set with a couple of super thin/flexible blocks that let you wet sand very curved panels without making fingerprint lines. I've used thin lexan/plexiglass from the hardware store to make my own since I lost a couple of the original set I bought from them, and you can make them whatever size that way. The original post just looks like hand print rubs causing the guidecoat to not stick as well, but figured I'd post these since its relevant to the conversation.

www.trueblox.com

Wet Sanding Blox

True Blox Wet Sanding Blox are used achieve the absolute flattest paint possible. The sanding blocks are meant only for the initial step of wet sanding to remove any texture and ‘orange peel’ from the paint. The hard material they are made of allows the sand paper to cut the paint completely...
www.trueblox.com
 
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