Step 1: Prepare the environment
The workplace environment contributes high quality work and safety.  A clean draft - free and well-lit mixing and casting are is fundamental.  So are adequate ventilation, temperatures, and sufficient work space.

All the necessary equipment except the casting frame ( this can be made using cardboard, children's building blocks, wood, etc.) is supplied with our Ura-Cast moulding making starter kit.

Step2: Preparing your pattern
Start with a pattern made of virtually any material: plastic, stone, concrete, metal, wood, etc...  Secure the pattern on a clean flat surface.  We have used double sided tape to prevent the pattern from moving or floating during the pour.

Step3: Build a casting form around the secure pattern:
This will prevent the silicone from leaking out around the sides and bottom until the silicone is cured.  Seal the seams around the form to ensure no material leak out or under the pattern.  Children's building blocks were used for this pour.  The seams were sealed with tape.  Forms can be made out of virtually anything nonporous that will prevent the material from leaking out.

Step4: Measure and mix the material being used:
Silicone was used because the pattern have several undercuts and back drafts.  A flexible material ensures easy pattern removal.  No release agent is required when using silicone.  Measure out the material to the manufacturer's specification.  This particular material is supplied with our Ura-Cast kit and is measured out 20 parts of base to 1 part of catalyst by weight.  Once the material is properly weighed out thoroughly mix the material for several minutes.

Note: Use a rhythmic down, around, and up motion.  Do not whip the material - this will introduce air into the mix and may result in air bubbles on the surface of your mould.

(A) Fist weigh out the Part "1" Ura-sil 4154	(B) Add catalyst "Part 2" Urasil 4154 at ratio      20-1 (1g or 1ml for every 20g or 20ml of      part1used)	(C) Stir well

Step5: Pouring the material
With the material thoroughly mixed, it is time to pour it into the casting box.  Target the pouring stream to the casting frames lowest surface.  Do not pour directly on the pattern as this may case entrapped air.  Find the lowest pouring spot and slowly pour the material at a constant rate.  Let the material rise up and over your pattern to help minimize entrapped air.

Step6: Allow the rubber to cure and demold
The curing stage is the wrong time to be impatient.  This is the project's most vulnerable stage.  Set a timer to avoid prematurely removing the pattern.  Regardless of urgency or need, demold when the manufacturer specifies!! After the material has cured, it is time to demold your pattern from the mold.  Carefully remove your casting frames and clamps around the mold.  Simply flex your mold and the pattern should come out.

Casting Instructions
Mix the A and B components together according to the products mix ratio until a uniformed mix is achieved. (Ura-cast PR 40 S 1:1 ratio eg. 10ml A component + 10ml B component)

(A) Measure out equal amount of Ura-cast pr40s Part "A" and Part "B"	(B) Add first part to mixing bucket	(C) Add pigment to mixing bucket

(D) Mix well	(E) Add second part to mixture	(F) Mix Well

Pouring the material
Target the pouring stream to the mold's lowest corner having the least detail.  You can also pour the material through a cone-shaped screen-wire sieve; this helps filter trapped air.  If you move the stream about, always let the material flood ahead of your pour stream.  Don't delay pouring the material and never scrap out the last few ounces from the mixing container, this could dislodge unmixed material into your casting.

Polymerization
The caring stage is the wrong time to be impatient, this is the project most vulnerable stage.  Set a timer ad avoid prematurely removing the models or mold.  Regardless of the urgency or need, demold when the manufacturer specifies!!!

Demold with care
Using a flexible mold simply flex the mold and the part should come out.  Take care not to tear the silicone.