Tag Archives: special effects

The How and Why of Silicone, (Part 3)

USING YOUR SILICONE:

So you are now fully equipped to choose exactly the right silicone product for your purpose, and you are champing at the bit to get started. So lets look at how to do that.

I’m not going to go into the entire multifaceted sculpting and mould-making process here, it would take me six months, and there are already a lot of fabulous resources out there…. (see post on My Makeup Books) what we ARE going to look at now  is the actual silicone itself and what you need to do to end up with a usable product at the end.

There are several things to do before you even open the product.

FIRST, make sure your workroom, tools and materials are neither too cold, nor too hot   This, I understand, can be tricky…. but especially in your first few attempts with silicone, it will make the process much smoother and increase your chances of success.  (All Technical Data sheets list the estimated geltime and total curing time of your product, at an ideal working temp of around 24C (about 75F).)
Wait a minute- chances?  You mean this isnt a guaranteed, easy peasy, smooth as pie process?  Weeeelllll…. technically, yes, it could be, as long as you follow the instructions perfectly and work in optimum conditions. But Im not going to lie to you- there are many things that can go amiss if you aren’t careful, and sometimes, even if you are…

SECOND, assemble your tools and materials.  You will need to make sure your materials and workspace are clean, and all components are compatible with the silicone of your choice- remember your list of inhibitors.  You really need to have an accurate electric scale measuring by the gram for working with silicones, plus a pocket scale that measures by 0.1 grams, especially if you are making prosthetics and the likes that use only small amounts… (see The How and Why of Silicone (Part 2) for some good pocket scales).  Dont forget the calculator and a notebook to write things down- NEVER assume you will remember it all.  Also, you will need to make sure you have CLEAN CONTAINERS. Never try and skimp on this… as my 16 yr old observed, recycling isnt a large part of Special Effects, and although we can re-use some things, it pays to be scrupulous when working with something as fussy and expensive as silicone.  You can save a container you have used for the same silicone before and remove the old cured mix, but if there are uncured parts you are best to dispose of them and start again. Some cardboard cups contain wax that can inhibit some silicones. Clean paper cups, plastic containers or foodgrade plastic buckets are best.
THIRD, it goes without saying that you should ALWAYS test your materials before starting your project.  It also goes without saying that most people simply don’t bother….

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The How and Why of Silicone. (Part 2)

HOW TO CHOOSE YOUR SILICONE    

Ok, so you have your project ready, you are off to go buy some silicone and dive right in….  Whoa!  Slow down, tiger….. There is a whole bunch of stuff you need to know first.

What are you doing?  Is it a big piece, a small piece? Are you making a mould or a cast?  Do you need to make a box mould, a brush-up mould, a matrix mould, a pour mould?  How much are you going to need to fill it?  Do you want a solid coloured, or translucent  silicone? Are you in a hurry or is time not an issue?  Will you need a long or short Potlife?  What sort of Viscosity is required? What Shore Hardness do you require in your finished piece? Do you need to worry about Elongation/Tear Strength/Tensile Strength?

Yeah, working with silicones is a bit like  doing high school chemistry all over again, but trust me, if you understand the basics, it will save you a lot of time, money and frustration.

Lets start with the Product Description. 

When you are searching a website for silicon moulding rubbers, you will usually find somewhere a link to a.pdf saying “Technical Data Sheet”, “Product Overview”, or the like.  In a catalogue there may be aTable giving comparisons between the products on offer.

Note that the information I am discussing here is NOT on the MSDS… (the what? I hear you say? It stands for the ‘Material Safety Data Sheet’- a topic for another time…).  

A Technical Data sheet will give you all of the relevant information you need about a product. Lets go through one step by step, just to give an example.

At the top there will normally be a Product Description.  This will describe the general characteristics of the particular silicone, its category and type, and an idea of its texture, hardness, mix ratio and suggested applications.

Here are a couple of examples I randomly pulled out of my file (you should always keep this info for future reference): Continue reading


Great Makeup Books & DVDs

If you want to start collecting some good reference materials, this list gives you some idea of where to start looking- it covers a small selection of the books and DVDs in my Makeup & FX Library.

I currently have over  300 books in my collection, not including filmmaking books.  I have books on ‘straight’ makeup as well plus other pictorial period and general references, hairstyling books, medical and forensic books, magazines, etc etc. They are in no particular order but I would start with the first two as they both contain information on the latest industry standard materials and techniques.

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