Help! sand papper edges leaves deeper scratches than the gri

Discuss anything after that final masking comes off.



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PostPosted: Wed Feb 18, 2015 3:21 pm
Hello
I've been lurking around here to some time now which have been helpful.
But now I need some advise which I haven't found any direct information about.

The problem I'm having is that the edges of the sandpaper leaves deeper scratches than the grit itself.
I'm water sanding with P2000 and the clear coat has been curing for about 3-4 weeks.
For sandpaper support I have a modified tool which is normally used when finishing tileing work in a bathroom for example. I don't have the word for it, but it's made of plastic, have a handle which is perpendicular to a rectangular plate which is covered with foam on the other side.
This is what it looks like:
Image


I'm folding up the paper on the long sides of the plate and the paper is sticking out on the short sides. It's the edges of the paper that is sticking out which are making the scratches.
These edges are factory cut with no deformation.
I'm thinking that if I would cut the paper so that no paper is sticking out I will have a deformed edges which will cause even bigger problems.

I'm a bit unsure why I'm getting these scratches but could it be possible that I get these because I didn't let the paper soak enough time in water before using them. Is that possible?

These scratches are quite hard too see until I start compounding.

Does anyone here have any tips on how I can avoid these scratches?

Thanks!



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PostPosted: Thu Feb 19, 2015 12:05 am
Only times I've had that problem is when I didn't let paper get soft enough. If I'm in a hurry now. I soak it in hot water.
With 2000 grit you should be able to buff them on out though.
If it ain't BROKE fix it till it is!!



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PostPosted: Thu Feb 19, 2015 4:00 am
Try one of these instead work good.
http://www.autobodytoolmart.com/3m-weto ... 15914.aspx

If your worried about being flat & strait these work well in water with paper wrapped around it.
http://www.autobodytoolmart.com/3m-rubb ... 15913.aspx
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.



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PostPosted: Thu Feb 19, 2015 6:30 am
The problem with all holders/supports is that the paper will always have an edge in contact with the paint.

I'm going to try what DURASPANK said and soak the papers in hot water and see if they get any softer.

Thank you both



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PostPosted: Mon Feb 23, 2015 1:37 pm
I just leave mine sit in a bucket of soapy water till they curl up and get soft they all have to be folded over the smaller sponges.
Warm water is nice for when its cold out but its not necessary.
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.



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PostPosted: Tue Feb 24, 2015 12:21 am
Hot water won't make them softer. Just makes it happen faster. That hard block isn't necessary past 1000 grit either. IMOp Actually I've never used a block for cut and buff. Unless I was workin on a sag/run. Then I use a paint paddle.
If it ain't BROKE fix it till it is!!



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PostPosted: Sun Mar 29, 2015 9:45 am
Hello again,
I just wanted to get back and say that the problem is now gone.
I'm now soaking the papers and tear of every factory cut edge.
Thank you all for your help

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