[Captions by Judy V. at Y Translator]
In today’s video,
we are revisiting our hydrophobic sand, In today’s video,
we are revisiting our hydrophobic sand, trying to make it even more
waterproof than before, and using a variety
of bright vibrant colors. [Music] A while back, we did a few
experiments trying to find a good way to make magic sand or hydrophobic sand. That’s a sand that
you can pour into water, but it repels the water, holding in
a sort of shield of air around itself, so that when you pull the sand
back up out, it’s dry sand, and pours all over the
same way dry sand would, rather than clumping together
the way wet sand does. We tested a silicone
waterproofing spray, Scotch Guard and NeverWet, a two-part product that’s really
just designed to repel water a lot. We got some pretty good
results with all of them, with the most water repelling
results from the NeverWet. However, I’ve done a little bit
more experimentation since there and there are a couple issues that
I keep running into with the NeverWet. First off, it’s a two-part spray, and the first one really makes
the sand clumped together. It hardens into almost this solid shell, and so after it dries, you have to break it back up
into the individual grains of sand. It’s hard to get a really
fine grain after you’ve done all that. Secondly, NeverWet seems to be
increasingly hard to find in stores. There are three places I used
to know you can get it that don’t seem to carry it anymore. So I decided to go back and try
and see if we can get better results with the other products. So the goal today is
to make hydrophobic sand that repels water just as well
as the NeverWet did by using our silicone spray
rather than the NeverWet. I also went out and I found some
colored jars of sand at a craft store, and they do come all the way full,
not half empty like they are here. But I had to do some experimentation, so that’s why we’re missing
some of the sand in these jars. To get started, all you really
need is some colored sand, your waterproofing silicone spray,
a little cup and some aluminum foil. Here’s the basic idea. Using colored sand from craft Store, we’re going to soak it
in waterproofing silicone, let it dry, and then add a second and
third layer of waterproofing just to make sure
it’s extremely hydrophobic. To start, let’s take some of our sand
and pour it into our small cup. If you want to try and
make a lot of it once, you can use the whole jar. If you only want a little bit, then just measure out
what you want to start with. In my last trial, I tried spraying
on three layers of the silicone spray, and it did work fairly well. We had some good
repelling of the water. We were able to get the sand
go down into the water, and come back up mostly dry. But it wasn’t quite
as good as I want, and I now believe that the reason for
that is it wasn’t completely coated. So when experimenting, I just found a
better way to coat the sand completely. So it makes sure that every
single grain is really slathered and surrounded by the silicone spray. That’s why we have it in a cup rather
than spread out on a cookie sheet, the way we did before. With our sand in the cup, the goal is to now spray in
so much of this silicone that it actually gets our sand
kind of soaking wet in the spray. I’m going to do that outside
because I definitely don’t want to be breathing that in in here. Let’s also take a small piece
of aluminum foil about this size. It’s not very important and what
we’re actually going to use this for, we’ll bend it a little bit in the middle and
we’ll spray our silicone right onto the foil, and let it drip and run down into the sand. [Music] At this point, our container is
soaked with the silicone spray. You can look at the bottom
of the container and see that even the sand all the way down there
is completely covered in our silicone. [Music] Now, that our sand is
completely soaked in our silicone, what we want to do is let it dry,
laying out flat on a piece of foil. Here’s a sheet of foil. I like to turn the edges up
so that when our sand is dry, it’s not so likely to just
slide or blow off the edge. Now let’s take our sand,
put it onto the foil and spread it out about as thin as we can get it. [Music] With the sand spread out,
now comes the slightly less exciting part. You have to let it dry out and
I mean completely dry out. The silicone will get to a point
where it no longer is causing the sand to stick together. And when that happens, it will act
like normal sand when you pick it up. it’ll just drop down
and be individual grains, not sticking together at all. If you leave it outside,
it can take 24 to 48 hours. If it’s sunny and warm,
it will definitely go faster. As another option
for speeding things up, If you happen to have built
one of our Dehydrotron 5000 food dehydrators, you can also use this to
help dry out your sand faster. I wouldn’t recommend
using it at full heat, but on medium heat with the fan going, it will dry out much faster in this box
than even sitting outside in the sun. When I made the Dehydrotron 5000, there were a few people who
pointed out that I was risking my safety by wiring the dimmer switch
to the white wire in the cord, rather than the black one. You are correct. It should be wired to the black
went and I have since rewired it, switching those together. Soldering them together
and using heat shrink rather than electrical tape. Whichever method you use,
sunshine or dehydrator, to dry out your sand, once it’s back to a dry crumbly state, it’s time to apply two more layers
of the Silicon using the same methods. Once again get our sand
completely soaked in the silicone, mix it up really well, flatten it out and let it dry. After the third time soaking
the sand and letting it dry out, whether in the Sun or the dehydrator your sand should now be ready
for testing and playing in the water. I’ve gone ahead and made
batches of our hydrophobic sand in five different colors and I’m excited
to see how it looks under water. [Music] Before we start using any of these
hydrophobic sands under water, I do want to take just
a quick look at the difference between the hydrophobic
sand that we’ve created, and the original untreated
sand that it starts as. Here’s our untreated sand, and here is the hydrophobic
sand that we’ve made. Now both of these
are dry and pretty powdery. You can see that there are
little bits of differences. I would say that the color on
our treated hydrophobic sand looks a tiny bit more vibrant
than our untreated sand. It’s not a big difference
but it’s a slight change in color. Another difference is that the
hydrophobic sand actually just feels somewhat softer, which means that gathering up all of
the tens of thousands of individual grains covered in the silicone, something is actually changing to make
it feel just a little bit spongier almost. I know some people think that sand
is coarse and rough and irritating, and it gets everywhere but the
hydrophobic sand is a little less course and rough and irritating. [Music] All right, here as the first test, I have a spoonful of
our red hydrophobic sand, I’m just going to dip that
down under the water, not even pour it, which is dip it down
and then pull it back up. [Music] Look at that.
Still just powder on top. Let’s pour some of those down
into the water and see what happens. [Music] Guys, this stuff is a ton of fun. It really does a pretty good
job of being hydrophobic. This sand has now been down in here
for like 15-20 minutes kind of thing, and when I pull it out,
it’s still like dry powdery sand on top. Now eventually, this can get
water absorbed into it, and if that happens,
all you need to do is spread it out, let it dry again, and it’s back to being good as new. Although in our case, we’ve now got,
instead of five different colors of sand, we’ve got five colors
of sand all mixed together, and you know if you
like that look, great! Otherwise, you want to keep your
different colors separated in the water if you ever want them to stay separated. Once they’re mixed,
there’s no unmixing them. Although I think I saw an episode of that
old Batman, the Adam West Batman, he had a machine designed to
separate out different colors of powders. If we can get one of those,
then this will be all settled. Colored sand and some
silicone waterproofing spray, which is sold with shoes
in most department stores. It’s just designed for spraying on
and then you make your shoes waterproof. But in this case we’re doing
the same thing with sand, and it’s pretty fun to play with. You can make some cool
like underwater sand castles and stuff, and it just forms these
weird little structures, and then stays dry when you pull
it out and it’s just a powder again. So much fun. It is coarse and rough and irritating. Like drawing my arm off. It’s just like under the paper towel
so it’s like hitting my arm with sandpaper, Anakin was right! Guys, that’s not all,
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