saw a video where the guy used his sandpaper once and tossed it
i made a box just to hold the stuff i have used
i like used for lots of situations
if i have some rough pieces that i just want to give a quick sanding
i reach for the used
have also found i can use a new 80 followed by a used 80 and i need
less work at 120 with overall fewer scratches from the 80
Use it until you feel it isn't working effectively any longer than then
change to new paper. Be more aggressive about changing paper, as most
people tend to use the paper too long. Just because dust is still coming
off the workpiece, doesn't mean your sandpaper is still good.
I keep it in a shoe box so it is as convenient as loose change.
Sometimes I write the grit# on the back. There are quite a few other
items in the shoe box too... I think the value of organization is
underestimated--I'm working on that... This shoe box is one of my
successes... ; )
This is one of those "it depends" situations.
You want to change paper when it no longer cuts well.
Generally this happens sooner on the coarser grits;
if you're using 1600 grit paper to polish metal it
will last a long time.
Sometimes worn sandpaper gives you better control when
you don't want to sand too aggressively. I used to
keep used belt-sander belts to use when sanding on the
lathe, because they were easier to hold than paper.
(the lathe, unfortunately, has seen no use in lo these
Beware of "polishing" rather than smoothing the surface,
which happens if the paper is too worn.
On Friday, April 15, 2016 at 7:55:15 PM UTC-4, Electric Comet wrote:
When my family was involved in Soap Box Derby, we did a lot of fiberglass
and bondo work. I used to do lot of building with a guy who was a master
at body work.
He hung onto sandpaper for a long time. When his 100 no longer worked as
100, it became his 150, then his 220, etc. Since we often raced "in primer"
things didn't need to be perfect until just before the final paint job.
That's when the new sandpaper came out and he got really meticulous.
"In primer" meant we were still modifying the cars throughout the season
as we worked our way towards the big end-of-season races. Any new fiberglass
or bondo would get covered with primer before the next race. Sometimes we'd
prime a section with a slightly different color primer even if we'd done
nothing to the body since the last race. It kept the competition guessing.
When you win a lot, people watch your every move. We liked to keep them off
Not really. To cut the grains of sand have to have sharp
edges. A worn piece of sandpaper doesn't have finer grits
than it started with, it just has dull, rounded over sand.
Now fiberglass and bondo are fairly soft and uniform, so
rounded over sandpaper may have worked after a fashion,
but in general it doesn't make sense to keep using paper
after it stops cutting easily.
Trying to eek out more life from "done" sand paper costs you more in time.
But contrary, a single sheet of that Festool Granat 120 grit paper will
last me a couple of projects. I have never seen anything last as long
as that stuff. Dried glue does not phase it.
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