Dura-block and self-adhesive sand paper issue

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PostPosted: Mon Jun 13, 2022 10:32 pm
Hi all!

Total novice here giving block-sanding a go. I used an electric DA with an 80-grit pad to get most of the existing clear and color off the hood. I bought a set of dura-blocks and a roll of dura-gold self-adhesive sandpaper.

My issue is as I sand with a criss-hatch pattern, the fine powder from the existing body filler and paint seems to work itself between the adhesive and the block. The sheet delaminates from the ends towards the middle after only 5-10 minutes of use. I cleaned the block with oil/wax remover and tried again with the same result. Any recommendations on how to keep the adhesive stuck-on? The paper itself is nowhere near worn out before it comes off the block.

Thank you!!
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PostPosted: Tue Jun 14, 2022 7:30 am
i clean mine with lacquer thinner, also are you giving the paper enough length to fold over each end of the block ?

might also be cheap sand paper
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PostPosted: Tue Jun 14, 2022 11:55 am
...and here I was thinking It was quality sandpaper LOL. Its $20 a roll but I don't have much reference.

The first application, I had the paper stop short of the edge, but tried again with an overlap on the ends. The overlap version actually delaminated faster. Curious if anyone else uses this brand? It is convenience since it is the width of a standard dura-block so just cut-to-length and apply. I am hoping I am just missing a step or technique.



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PostPosted: Tue Jun 14, 2022 12:21 pm
dont recall what brand of sandpaper i bought but ran into the issue. i squirted a couple of dabs of 3M super 77 on the back of the paper, making sure to have a dab at both ends before the sandpaper rolled around the ends,and let it dry. that worked good for me.

edit:
when sanding, let the paper do the work. dont put too much pressure towards the panel.



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PostPosted: Tue Jun 14, 2022 2:44 pm
So I was looking for that! A spray adhesive that would mimic the performance of tape/self-adhesive. Will 3M 77 pull-off? As-in, is it temporary enough that it does not damage your durablock when removed?

10-4 on the pressure applied while sanding. Il try the next role with as little pressure as possible.

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PostPosted: Tue Jun 14, 2022 2:59 pm
Ahajmano wrote:...and here I was thinking It was quality sandpaper LOL. Its $20 a roll but I don't have much reference.

The first application, I had the paper stop short of the edge, but tried again with an overlap on the ends. The overlap version actually delaminated faster. Curious if anyone else uses this brand? It is convenience since it is the width of a standard dura-block so just cut-to-length and apply. I am hoping I am just missing a step or technique.


Sorry dont mean to imply youre cheap or anything like that lol.

I'm just not familiar with it and have known cheap papers to not work well.

another trick you can try is to clean block well and mask it with some good tape making sure to go over the ends, most PSA paper will stick better to the tape and good 3M yellow or green will stick to the dura blocks well
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PostPosted: Tue Jun 14, 2022 3:40 pm
Ahajmano wrote:...and here I was thinking It was quality sandpaper LOL. Its $20 a roll .

Quality Sand paper pays for itself.

I spray my blocks with a little spray glue let it dry a bit then stick the paper on.
What you describe Is pretty normal for ALL of those foam blocks.
And yes they do deteriorate with time & use.

I cannot claim that I have any Foam blocks that I really like.
But I like my 3M blocks!
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PostPosted: Tue Jun 14, 2022 3:53 pm
I recently tried a roll of the Dura-gold paper. It is extremely thick and stiff compared to 3M and Norton PSA paper.

Same thing happened when using a Durablock. I switched back to my wooden block similar to this one:
16InchSandingBlock.jpg
16InchSandingBlock.jpg (5.83 KiB) Viewed 3538 times
to use up the remainder of that roll.

Never had an issue with 3M or Norton PSA rolls sticking. Just keep the bottom clean like PainterDave said and it will stick just fine.

As for long lasting, it is very hard to beat 3M sandpaper. I have partial rolls of 180, 220, 320 and 400 grit that have been in my cabinet for years now. No issues with any of them. It also seems to last longer on the sanding block as well.
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PostPosted: Tue Jun 14, 2022 4:58 pm
Ahajmano wrote:So I was looking for that! A spray adhesive that would mimic the performance of tape/self-adhesive. Will 3M 77 pull-off? As-in, is it temporary enough that it does not damage your durablock when removed?

.

if its not allowed to dry, some can stick on the durablock and wreak havoc.
the suggestion of tape on the block first might be wise.



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PostPosted: Tue Jun 14, 2022 9:43 pm
tomsteve wrote:if its not allowed to dry, some can stick on the durablock and wreak havoc.
the suggestion of tape on the block first might be wise.


Exactly, ends up pulling foam when you remove used paper. I hate cheap foam blocks.
But their is a time and place for soft foam blocks too.

I like the 3M stick it blocks
https://www.toolsid.com/3m/stikit-16-x- ... Y4QAvD_BwE

https://www.jbtools.com/3m-05441-stikit ... h8QAvD_BwE

https://www.google.com/search?q=3M+stik ... 2687824863

Nice blocks some are softer than others, I like Hard blocks myself but I do have some soft ones. no problems with paper sticking to them when their clean.
Last edited by Doright on Tue Jun 14, 2022 9:46 pm, edited 1 time in total.
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