Basics of Mold Making How‑To's

These videos and step-by-step photo tutorials will introduce you to basic techniques for successful moldmaking. These tutorials are suitable for beginners. Whether you are interested in reproducing a sculpted figure, an antique picture frame, an industrial pattern, an architectural molding, a fossil, animal skin (taxidermy), the texture of a piece of fabric, or a toy, you start by making a rubber mold. Whether you want to make one or one thousand reproductions of an original, you can do it using a mold. Whether your original model is made from clay, wax, plaster, sand, concrete, stone, metal, bone or almost any material, making a rubber mold makes it possible to reproduce that model – exactly.
Basics of Mold Making

Download our How-To Booklet

Download our How-To Booklet

Smooth-On is here to take the guesswork out of making flexible molds and castings

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How To Mold a Prop Shield For Cosplay

How To Mold a Prop Shield For Cosplay

Jon N. shows us how he creates a mold for his Thundercats shield.

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Casting Concrete Using Aquacon® Release Agent

Casting Concrete Using Aquacon® Release Agent

AquaCon® is a water based concrete release agent that aids in releasing concrete castings from Smooth-On rubber molds

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Making a Simple Block Mold Using Mold Star® 15 Silicone

Making a Simple Block Mold Using Mold Star® 15 Silicone

Mold Star® 15 is an easy to use Shore 15A platinum silicone that is mixed 1A:1B by volume.

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How To Make a 1-Piece Silicone Cut Mold

How To Make a 1-Piece Silicone Cut Mold

Mold Star® 15 is perfect for experienced mold makers or people just starting out.

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Making a Simple Block Mold Using OOMOO® Silicone

Making a Simple Block Mold Using OOMOO® Silicone

This mold making tutorial video shows how to make a one piece silicone block mold using OOMOO® silicone rubber

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Making a 2 Part Mold Using Mold Star® 15 Silicone

Making a 2 Part Mold Using Mold Star® 15 Silicone

This video outlines the 2-part block mold making technique using silicone rubber.

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Making a 2-Piece Mold Using OOMOO® Silicone

Making a 2-Piece Mold Using OOMOO® Silicone

Mold box construction, model preparation and release agent application for a 2 part pour on mold are covered in this video.

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Molding a 3D Object Using Rebound™ 25 Silicone Rubber

Molding a 3D Object Using Rebound™ 25 Silicone Rubber

This tutorial shows how to create a Rebound™ 25 brush on silicone mold of a figurine

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Making a Concrete Stamp Using Urethane Rubber

Making a Concrete Stamp Using Urethane Rubber

Project goal: transform a disused service entrance into an inviting stamped concrete walkway.

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How to Use a Concrete Stamp

How to Use a Concrete Stamp

Project: Replace existing service entrance with a decorative concrete walkway.

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Beginner’s Guide to Making Simple Candle Molds

Beginner’s Guide to Making Simple Candle Molds

OOMOO® Silicone Rubber is one of the easiest mold rubbers to use on the planet and is perfect for making simple candle molds.

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How To Build a Hot Box Oven For Heat Curing Materials

How To Build a Hot Box Oven For Heat Curing Materials

We’ve come up with a way to easily build a cheap “hot box” to any size you want...

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Creating Metallic & Glitter Effects with Cast Magic®

Creating Metallic & Glitter Effects with Cast Magic®

Cast Magic® Casting System is an easy way to add an endless variety of bright metallic, glitter and color effects to your castings.

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Eliminating Bubbles In Resin Castings By Pressure Casting

Eliminating Bubbles In Resin Castings By Pressure Casting

Bubbles in clear castings can be removed by using a pressure casting technique, a shown in this tutorial video.

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Reducing Bubbles In Castings By Vacuum Degassing

Reducing Bubbles In Castings By Vacuum Degassing

Clear resin performs best when the material is vacuumed before pouring, this tutorial video outlines the steps for degassing.

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UVO® and So-Strong® Comparison

UVO® and So-Strong® Comparison

How a casting made with UVO® pigment and an equal amount of So-Strong® compare

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Extending the Shelf Life of Urethane Rubber and Resin

Extending the Shelf Life of Urethane Rubber and Resin

XTEND-IT® is a dry gas blanket designed to extend the shelf life of moisture sensitive polyurethane products.

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How To Remove The Lid From a 1-Gallon Pail

How To Remove The Lid From a 1-Gallon Pail

Smooth-On one gallon pails are easy to open once you know the proper technique.

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Creating a Marble Effect Using Urethane Plastic

Creating a Marble Effect Using Urethane Plastic

Creating a realistic cast marble effect is possible with Smooth-Cast® 325 liquid plastic.

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How To Use The Kwikee® Sprayer

How To Use The Kwikee® Sprayer

Using the Kwikee® Sprayer to spray mold making and casting release agents will save you over 60% vs. aerosols.

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How To Pre-Mix Urethane Casting Resin - TASK® 3

How To Pre-Mix Urethane Casting Resin - TASK® 3

Properly pre-mixing a urethane casting resin is important to ensure the material cures properly.

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How To Pre-Mix Urethane Casting Resin - Feather Lite®

How To Pre-Mix Urethane Casting Resin - Feather Lite®

This video will illustrate the proper way to pre-mix Smooth-On Feather Lite urethane resin...

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Two Piece Silicone Mold of a Knife

Two Piece Silicone Mold of a Knife

We demonstrate using Mold Star 30 silicone, a platinum silicone for mold making...

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How To Mix Urethane Casting Resin - Double Mix and Pour Feather Lite®

How To Mix Urethane Casting Resin - Double Mix and Pour Feather Lite®

Using the double-mix and pour technique helps to alleviate issues with unmixed resin.

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How To Pre-Mix Silicone Rubber - OOMOO® 25

How To Pre-Mix Silicone Rubber - OOMOO® 25

Not premixing silicone can result in the material not setting up correctly...

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How To Mix Silicone Rubber - Double Mix and Pour OOMOO® 25

How To Mix Silicone Rubber - Double Mix and Pour OOMOO® 25

This mold making essential video demonstrates the double mix and pour technique using a 1A:1B OOMOO silicone rubber.

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Using Glow Worm® to Make a Glow In The Dark Casting

Using Glow Worm® to Make a Glow In The Dark Casting

How to best use Glow Worm phosphorescent powder to create a resin casting which will glow in the dark for up to 10 hours.

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How To Measure Silicone By Weight - Mold Max® 20

How To Measure Silicone By Weight - Mold Max® 20

How to use a gram scale to accurately weigh rubbers, plastics and other materials.

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How to Double Mix and Pour Mold Max® 14NV Silicone

How to Double Mix and Pour Mold Max® 14NV Silicone

Inadequate mixing is the number one reason for silicone rubber not curing. This video demonstrates the double mix and pour technique.

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How To Measure Urethane By Weight - Simpact® 85A

How To Measure Urethane By Weight - Simpact® 85A

How to use a gram scale to accurately weigh rubbers, plastics and other materials.

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Casting Quickies - Smooth-Cast® 300 White Liquid Plastic

Casting Quickies - Smooth-Cast® 300 White Liquid Plastic

The Smooth-Cast® 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free.

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How To Vacuum Degas Silicone - Mold Max® 30

How To Vacuum Degas Silicone - Mold Max® 30

How to vacuum silicone to eliminate entrapped air and remove bubbles from your finished mold or casting.

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Casting Quickies - Smooth-Cast® 325 - ColorMatch Urethane Resin

Casting Quickies - Smooth-Cast® 325 - ColorMatch Urethane Resin

In this resin casting tutorial video, we demonstrate how to mix and pour Smooth Cast 325 liquid plastic resin.

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How To Vacuum Degas Urethane Resin - Smooth Cast® 326

How To Vacuum Degas Urethane Resin - Smooth Cast® 326

This video demonstrates vacuum degassing Smooth-Cast 326 to remove entrapped bubbles.

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How To Build a Mold Box

How To Build a Mold Box

Making a mold box for mold making. The mold box serves as a containment field for the mold rubber.

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How to Open and Dispense a 5 Gallon Pail of Material

How to Open and Dispense a 5 Gallon Pail of Material

Opening and dispensing from a 5 gallon pail properly will result in less wasted material.

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Making a One Piece Urethane Block Mold

Making a One Piece Urethane Block Mold

How to build a mold box, measure, mix, and pour urethane rubber to make a 1-piece block mold.

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Casting Smooth-Cast 300 Liquid Plastic Casting Resin Into a Urethane Mold

Casting Smooth-Cast 300 Liquid Plastic Casting Resin Into a Urethane Mold

Preparing a urethane mold for casting, measuring and mixing liquid plastic.

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Making A Brush-On Mold Using Brush-On Urethane

Making A Brush-On Mold Using Brush-On Urethane

Hot to create a brush on urethane mold of an original sculpture.

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Using duoMatrix NEO For A Rotational Casting

Using duoMatrix NEO For A Rotational Casting

duoMatrix NEO® is a versatile polymer modified gypsum system that has superior physical and performance properties

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Types Of Mold Rubber

Types Of Mold Rubber

Examining the different types of RTV mold rubber available for mold making and casting from Smooth-On.

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Moldmaking And Casting Terms

Moldmaking And Casting Terms

Common terms and definitions in the mold making and casting processes from Smooth-On.

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Metal Cold Casting With Smooth-Cast® 325 Resin

Metal Cold Casting With Smooth-Cast® 325 Resin

The metal cold-casting process is faster and much less expensive compared with foundry casting of molten metal.

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How to Make a Silicone Mold of 3D Print

How to Make a Silicone Mold of 3D Print

This video demonstrates how to use Mold Star 20T to make a silicone mold of extruded PLA.

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Making a Plasti-Paste® Support Shell for a Brush-On Mold

Making a Plasti-Paste® Support Shell for a Brush-On Mold

How to make a support shell for a brush on silicone mold using Plasti-Paste trowelable plastic.

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How To Mold and Cast Foam Props - Via Tested.com

How To Mold and Cast Foam Props - Via Tested.com

Via Tested - How to make simple silicone molds to cast and paint foam replicas of props like shop tools

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Making a Hollow, Impact Resistant Casting Using Smooth-Cast® 57D

Making a Hollow, Impact Resistant Casting Using Smooth-Cast® 57D

Using the slush method of casting to create a hollow, impact resistant piece.

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How To Make a Metallic Finish Using Cast Magic® Powder

How To Make a Metallic Finish Using Cast Magic® Powder

How to use Pearly Green Cast Magic® powder on a black ONYX® resin casting to get a beautiful metallic finish.

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How To Use The Aluminum Pail Opener

How To Use The Aluminum Pail Opener

Aluminum pail opener opens and re-seals 1 gallon and 5 gallon plastic pails.

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How To Repair a Torn Urethane Rubber Mold

How To Repair a Torn Urethane Rubber Mold

Repairing a torn urethane rubber mold using Ure-Bond® II urethane adhesive.

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How To Rotocast a Hollow Part Using Smooth-Cast® 65D

How To Rotocast a Hollow Part Using Smooth-Cast® 65D

Creating a hollow casting with high impact resistance by rotating a mold while casting.

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Recreating an Antique Frame using Mold Max™ 29NV No Vacuum Required Silicone

Recreating an Antique Frame using Mold Max™ 29NV No Vacuum Required Silicone

Learn how to use Mold Max 29NV for creating a high-detail silicone mold

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