Jack A Lopez

  • Date JoinedMay 11, 2008
  • Total Views399,984
  • Featured %66%
  • Best Answers %19%


SamanthaT8 months ago


I just read an old post of yours about silicone caulk and moulds. I wonder if you can help me?

I am trying to make a fat replica (as the ones you can buy are really expensive). Do you think if i follow your instructions below, i could make one? The ones you buy are coloured pale yellow/orange and are squidgy like a rubber to the touch.

One way to fix the gooey-center problem is to mix in with the silicone caulk, a small amount of water, plus emulsifier to help it mix, and the usual practical way to do that is using a smidgen of water-based acrylic paint. As a bonus the paint pigment gives a visual indicator of when you have it completely mixed.

Many thanks for any help you can offer..


Jack A Lopez (author)  SamanthaT8 months ago

Hello Sam!

I am having a little trouble picturing what a "fat replica" is. No, wait... I just did a Google(r) image search on that phrase. Yellow/orange and rubbery... You're talking about adipose tissue? I.e. fatty tissue? I.e. what the fatty insides of fat people look like. Well,that's kinda icky.

I think mixing silicone caulk with orange acrylic paint, I think that will give you something orange and rubbery when it cures. Also having the water that was in the wet acrylic paint distributed through the volume of it, I think that water will serve as catalyst to make sure the inside cures, like I was writing before, on that question on the Answers forum,


By the way, I do not consider myself an expert on this subject, and there are other authors who have done things like this, and even written 'ibles, with pictures, and instructions, and everything, e.g.


Also there seem to be a large number of people who are using mixtures based on silicone caulk for to make molds. Then the silicone mold is used to cast some kind of plastic resin. For example a "Let's Make:" search on "cast silicone"


returns a whole bunch of these.

iceng9 months ago

Thought you might like to see a closet EDB

Jack A Lopez (author)  iceng9 months ago

Hey Iceng! Thanks for sharing.

Actually, I am still following the discussion over at,


even though I haven't commented over there, and I saw the video of your closet railing over there too, as a reply to Max's comment about a pipe with a slit so "current cannot flow".

It kind of looks like, even with a big wide slit, the magnet still falls slowly, which I guess means there are still places in the metal, on either sides of the slit, where eddy currents can form.

pkb41124 years ago
Hi Jack A Lopez,

I was recently doing some searching on electromagnets, which led me to a discussion that you were involved in on the topic of a small EMP. I saw that you were able to make a "Piezopen", and I am really interested in this idea. Do you think you could possibly make an instructable about this, or maybe just email me some more info? It seems like a pretty cool little gadget.

Jack A Lopez (author)  pkb41124 years ago
That's something I've been meaning to do anyway: write and instructable on how to make one of those things. I will see if I can get that accomplished sometime this week. If don't meet this deadline, you get the consolation prize, which is me just describing in words how I built the thing, and maybe a few pictures of the last one I have.

Most of the work on the piezo sparky pen was done a few years ago. I made a bunch of them. Some I gave away. Some got lost. And I think there's one that I still know where it is.
Jack A Lopez (author)  Jack A Lopez4 years ago
Finally, my Piezo Pen 'ible. Just published it. Here:

Bartboy6 years ago
Related to the Jackelope?
Jack A Lopez (author)  Bartboy6 years ago
I can neither confirm nor deny such a relationship. Nor would I be at liberty to discuss jackalopes, if indeed such animals did in fact exist.

Well, I'm not talking about normal Jackelopes, I'm talking about KillerJackelopes.
Jack A Lopez (author)  Bartboy6 years ago
Oh! You mean this guy, er bloke. His profile says he's a bloke.<br /> <a href="http://www.instructables.com/member/killerjackalope/">http://www.instructables.com/member/killerjackalope/</a><br /> <br /> The answer is 'no', no relation. BTW looking at the "member since" fields reveals KJ joined instructables before I did, thus making him the <em>Original Jackalope</em>, or OJ, for whatever that's worth.<br /> ;-)<br />
Jack A Lopez (author) 6 years ago
Not sure where else to put this. The PDF attached to this comment is an old communique from the Barbie Liberation Organization (aka B.L.O.), an instructable written prior to the creation of the Instructables web site. It's a little piece of hardware-hack history I think is worth preserving.

Especially since many of the original hyperlinks are broken.
http://users.lmi.net/~eve/barbie.html (broken link)
http://web.archive.org/web/20070629123558/http://users.lmi.net/~eve/barbie.html (archive.org)
http://web.archive.org/web/20070629123558/http://users.lmi.net/~eve/download/barbiedir.pdf (archive.org)
barbiedir.pdf(612x792) 130 KB

Hello! Welcome to Instructables!

I am the Instructables Robot. My job is to alert you whenever someone leaves you a comment or sends you a private message. I spend most of my day sending email. I like sending email.

You probably want to upload an image to your profile. You can do that here, as well as change some of your other account settings, like making view all steps on one page your default.

After that, check out How to make a great Instructable, The Guided Tour of Instructables, and the Help Group if you have any questions.
Jack A Lopez (author) 7 years ago
What's an orangeboard?