Basics of Mold Making How‑To's

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

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Discover the advantages and considerations behind block molds, brush-on molds, and cavity pour molds.

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Learn how to make a simple silicone mold using Mold Star™ 15 liquid silicone rubber.

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

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

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

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

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

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

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

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

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

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

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

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Learn how back pressure results in a tighter cell structure and better foam castings

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How to use Sil-Poxy® silicone adhesive with a special reinforcement fabric to repair a torn mold liner.

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

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

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A one piece cut block mold is a popular mold making method that has some definite advantages.

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

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

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

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The spiral blade of the Green Meenee quickly mixes a variety of Smooth-On products faster than hand mixing.

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

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

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

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

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

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

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

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

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

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

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

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

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Milo shows how you can easily remove stuck lids and keep them from sticking in the future.

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Milo demonstrates how you can use a pressure chamber to achieve bubble-free castings.

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