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Folding Sandpaper

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Blog entry by Rich posted 10-28-2017 05:32 AM 937 reads 1 time favorited 6 comments Add to Favorites Watch

I know this seems like a trivial thing, but after folding sandpaper this way for decades, I was surprised to find only one youtube video that discussed it, and even it failed to mention the folding order needed to easily use all four surfaces of the folded sheet.

When sanding, while getting into tight places, and following contours requires a single thickness of paper, hand-sanding flat surfaces without a block is difficult with one layer. For one, there is nothing to stiffen the paper, and with just the paper backing, it tends to be slippery and difficult to manage. I prefer folding the sheet so that the grit is on the front for sanding and on the back for a good grip as I sand. Simply folding the sheet in half results in something that doesn’t have the stiffness I think works best. I find that a four fold method works best for me.

You can do this with any rectangular piece of sandpaper, but since the aspect ratio of the folded piece matches the ratio that you start with, it’s best to begin with something regular, like a full sheet, or a quarter sheet. Long, thin strips don’t work so well, although there are ways to fold them too, but the result is not as solid and easy to use.

Start off with your paper. I’m using a quarter sheet.

You can make your first fold either way, but I prefer to fold along the long edge.

Crease that fold. Since the grit is on the outside, it’s not practical to run your fingernail along it like you might do with regular paper, so I like to use a roller.

Repeat the fold in the other direction.

Now cut from the center out to the edge along the longer dimension. You can go the other way too, this is just how I do it.

(Here, I’ve turned it 90 degrees).

Now, fold the first flap up and crease it.

Then fold that part over. (I turned it 90 degrees again)

And finally, fold it into its final shape.

What you wind up with has grit on both surfaces and is pretty stiff, so that you can sand away, then flip it over when that side gets worn, clogged, whatever. When you’ve exhausted both sides, unfold the paper and refold it so that the two unused surfaces are on the outside and continue sanding until they are spent. At that point, you’ve gotten total use out of the sheet and can toss it.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner



6 comments so far

View knockknock's profile

knockknock

449 posts in 2225 days


#1 posted 10-28-2017 10:28 AM

Interesting, I will have to try this. Thanks.

-- 👀 --

View tyvekboy's profile

tyvekboy

1775 posts in 3065 days


#2 posted 10-28-2017 01:22 PM

That’s a good tip. I’ll have to try it too.

-- Tyvekboy -- Marietta, GA ………….. one can never be too organized

View TungOil's profile

TungOil

975 posts in 547 days


#3 posted 10-28-2017 05:14 PM

good tip Rich. I like that you have avoided folding grit against grit to keep the paper sharp.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View EarlS's profile

EarlS

1249 posts in 2400 days


#4 posted 10-29-2017 12:15 PM

Huh – I never put much thought into my small pieces of sandpaper for corners. Usually I just sort of fold a piece into something resembling a square and go from there. This makes so much more sense that now I’m asking myself why I never thought about a better way to utilize the whole piece and not just most of it.

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View Rich's profile (online now)

Rich

3177 posts in 641 days


#5 posted 10-29-2017 02:17 PM


good tip Rich. I like that you have avoided folding grit against grit to keep the paper sharp.

- TungOil

Thanks for mentioning it, Tung. That is one of the benefits I forgot to include. I first saw this tip so long ago, I don’t even remember where.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View Rich's profile (online now)

Rich

3177 posts in 641 days


#6 posted 02-14-2018 09:11 PM

This is quite a coincidence. I mentioned that I first saw this tip long ago and didn’t recall where. I was just going through some old Fine Woodworking magazines looking for a particular Tage Frid article and ran across this in issue #45, March/April 1984:

Now I know where I saw it, and it was indeed very long ago. Like, 34 years…lol

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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