How to Make a Urethane Mold
How to Make a Simple Urethane Mold
Urethane molding is an effective way to create simple block molds for casting resins, concrete, and plaster. Unlike latex molds, urethane molds do not require a rigid mother mold, making them quicker and easier to produce. Follow this step-by-step guide to create your own urethane mold successfully.
Step 1: Prepare the Base and Object
-
Choose a smooth, nonporous base such as acrylic to prevent adhesion issues.
-
Secure the object to the base using a hot glue gun to ensure it does not float when urethane is poured.
Step 2: Create a Mold Container
-
Select a container that fits your object’s shape. A simple paper cup works well for small parts.
-
Use hot glue to seal the container’s base, ensuring there are no gaps or pinholes where the liquid urethane could leak.
Step 3: Apply Mold Release
-
Urethane sticks to most surfaces, so a mold release agent is essential.
-
Use PA 2300 mold release and apply it lightly in a fogging motion. Avoid over-application, as excessive mold release can degrade the urethane’s quality.
Step 4: Determine the Mold Volume
-
To measure the amount of urethane needed, fill the container with rice to the desired level.
-
Transfer the rice to a measuring cup to determine the exact volume required.
-
Avoid using water, as it requires drying time and can cause contamination.
Step 5: Mix the Urethane RTV
-
Urethane RTV consists of Side A and Side B, which must be mixed in a 1:1 ratio by volume.
-
Side A is a thick, clear liquid. Take precautions:
-
Apply petroleum jelly to the can’s groove and lid to prevent it from permanently sealing.
-
Wipe excess material from the can’s groove after pouring to avoid hardened residue.
-
To extend shelf life, use Poly Purge dry gas before sealing the can.
-
-
Side B is a thin, brown liquid that must be stirred before use.
-
For accurate mixing, pour equal amounts of Side A and Side B into separate cups, then combine them in a third container.
-
Stir vigorously for two minutes, scraping the sides to ensure thorough mixing.
Step 6: Pour the Urethane
-
Pour the mixed urethane into one corner of the mold to allow it to flow naturally over the object, pushing out air bubbles.
-
Stirring creates some bubbles, but they will release during the 24-hour curing process.
-
The trouble-free bubble release makes urethane an easy-to-use molding material.
Step 7: Demold and Use
-
After 24 hours, the urethane mold is ready for use.
-
Urethane molds are durable and can cast all resins, concrete, and plaster.
-
Note: Mold release will remain on the cast parts, making them difficult to paint. If painting is required, consider using silicone RTV instead.
By following these steps, you can create high-quality urethane molds efficiently and effectively. Happy molding!
What does TAP do?
<p><strong>Discover What TAP Plastics Can Do for You</strong></p> <p>At TAP Plastics, one of the most common questions we receive is: <em>Wha
TAP Plastics Store Tour
<p><strong>Explore TAP Plastics: A Retail Store Tour</strong></p> <p>Welcome to TAP Plastics! If you’ve ever wondered what we sell, you’re in f
TAP DIY: Custom AC Vent Window Adapters
<h1>Custom AC Vent Window Adapters – Get the Perfect Fit at TAP Plastics</h1> <p>Summer is coming, and if you don’t have central air conditioning, a portab
How To Make Fiberglass Part - Part 2
<p><strong>How to Make a Fiberglass Part from a Mold</strong></p> <p>Creating a fiberglass part from a mold requires careful preparation, applicati
How To Make Fiberglass Part - Part 1
<h1>How to Make a Fiberglass Mold: Step-by-Step Guide (Part 1)</h1> <p>Fiberglass molding is a great technique for duplicating parts, such as a boat hull. This
How To Repair Wood with Fiberglass
<p><strong>Quick and Invisible Wood Repair: A Step-by-Step Guide</strong></p> <p>Wood repairs, whether indoors or outdoors, can be quick, seamless,
How to Cut Plastic Sheets
<p><strong>How to Cut Plastic Sheets: A Guide for DIYers and Professionals</strong></p> <p>The best way to cut plastic sheets, like acrylic plexigl
How to Make a Latex Mold
<p><strong>How to Make a Simple Latex Mold with TAP Premium Liquid Latex Rubber (NOTICE: TAP Premium Liquid Latex Rubber has been DISCONTINUED)</strong></p>
How to Make a Urethane Mold
<p><strong>How to Make a Simple Urethane Mold</strong></p> <p>Urethane molding is an effective way to create simple block molds for casting resins,
How to Make a Simple Silicone Mold Part 1
<p><strong>How to Work with TAP Silicone RTV System: A Step-by-Step Guide - Part 1</strong> (<a href="https://www.tapplastics.com/product_info/videos/how_
How to Make a Simple Silicone Mold Part 2
<p><strong>How to Mix and Pour <a href="https://www.tapplastics.com/product/mold_making_materials/mold_making_supplies/tap_silicone_rtv_mold_making_system/61&qu
How to Build a Box with Plastic
<p><strong>How to Build a Basic Acrylic Box: A Step-by-Step Guide</strong></p> <p>Plastic is a fantastic material for creating a variety of project
How to Make a Two-Part Mold
<p><strong>How to Make a Simple Two-Part Mold Using Urethane RTV Rubber</strong></p> <p>Creating a two-part mold is essential for capturing the det
How to Build a Mold Box
<p><strong>How to Make Mold Boxes for Urethane and Silicone RTV Molds</strong></p> <p><a href="https://www.tapplastics.com/product/mold_mak
How to Make Jewels, Gems, Crystals, and Pendants
<p><strong>How to Make Your Own Jewelry, Gems, and Crystals with Casting Resin</strong></p> <p>Creating your own custom jewels, gems, crystals, and
How to make a Resin Table Top Part 1
<p><strong>How to Create a Custom Resin Tabletop with Embedded Designs</strong></p> <p>Nothing matches the beauty of a crystal-clear resin tabletop
How to Make a Resin Table Top Part 2
<a href="https://www.tapplastics.com/product_info/videos/how_to_make_a_resin_table_top_part_1">Click here</a> to see Part 1. <p> </p>
How to use Envirotex Lite and Ultra-Seal
<p><strong>Guide to Using Ultra-Glo and Ultra-Seal</strong></p> <h3>Introduction</h3> <p>This guide provides step-by-step instructio
How To Glue Acrylic
<p><strong>A Beginner's Guide to Gluing Acrylic: Tips and Techniques</strong></p> <p>Gluing acrylic is a unique process that differs significantly
How to Bend Plastic
<p><strong>A Complete Guide to Bending Plastic with a Strip Heater</strong></p> <p>Bending plastic is an essential technique for many DIY and profe
How to build a Plastic Heat Bender
<p><strong>How to Build and Use a DIY Plastic Line Bender</strong></p> <p>Bending plastic sheets at home is made easy with a DIY line bender. This
How to Polish and Repair Scratched Plastic
<p><strong>How to Polish and Maintain Plastic for a Sparkling Finish</strong></p> <p>Plastic is a beautiful and decorative material, known for its
How to Polish and Shape Plastic Edges
<p><strong>Acrylic Edge Finishing Techniques</strong></p> <p>Acrylic plastic can be incredibly beautiful, especially when its edges are properly pr
How to Repair Scratched CDs, DVDs, iPods and more
<p><strong>How to Restore Scratched Plastics with the Novus Polish System</strong></p> <p>Scratched plastic surfaces can be frustrating, but you do
How to Protect Your LCD or LED TV
<p><strong>Protect Your LCD and DLP TV Screens with a Custom Screen Protector</strong></p> <p>LCD TVs, DLP TVs, and LCD computer monitors have soft
Fiberglass Repair Guide
<p><strong>Fiberglass Repair Guide</strong></p> <p>This guide provides a step-by-step demonstration of a simple fiberglass repair. The methods outl
How to Repair Gelcoat Part 1
<p><strong>How to Perform a Simple Non-Structural Gel Coat Repair</strong></p> <p>Gel coat is a protective outer layer applied to fiberglass surfac
How to repair Gelcoat Part 2
<p><strong>How to Apply and Finish Gel Coat for Fiberglass Repair (</strong><a href="https://www.tapplastics.com/product_info/videos/how_to_repair_gelcoat
How to Waterproof with Coat-It
<p><strong>How to Create a Tough, Waterproof Coating with Coat-It</strong></p> <p>Creating a durable, waterproof coating requires the right materia
How to Apply Vinyl Graphics
<p><strong>How to Install Self-Adhesive Vinyl Graphics for a Professional Finish</strong></p> <p>Self-adhesive vinyl graphics are an affordable and
How to Select Window Film
<p><strong>A Comprehensive Guide to Choosing the Right Window Film</strong></p> <p>Window film can offer tremendous benefits to your home or busine
How To Install Window Film
<p><strong>How to Install Window Film Like a Pro</strong></p> <p>Installing window film in your home or business is an excellent way to achieve pro
Cosplay DIY Supplies
<p><strong>The Ultimate Cosplay Materials Guide from TAP Plastics</strong></p> <p>Bringing your cosplay dreams to life requires the right materials
TAP InstaShape Video Demo
<h1><strong>How to Use TAP Insta Shape: A Versatile Moldable Plastic for DIY & Cosplay</strong></h1> <p>TAP Insta Shape is a moldable therm
Plastic Containers at TAP Plastics
<h1>Find the Perfect Container for Every Need at TAP Plastics</h1> <p>TAP Plastics offers a wide variety of <strong>containers</strong> designed fo
Display Items at TAP
<h1><strong>Custom & Ready-Made Display Cases, Stands, and Boxes – TAP Plastics</strong></h1> <p>Looking for the perfect way to showcase
Fiberglass Roller
<p><strong>A Guide to Fiberglassing with Rollers</strong></p> <p>Fiberglassing with rollers is an efficient way to create strong, lightweight, and
Guide to Rod Stock and Shapes at TAP Plastics
<p><strong>Guide to Rod Stock and Shapes at TAP Plastics</strong></p> <p><a href="https://www.tapplastics.com/product/plastics/plastic_rods
Tubing Options at TAP Plastics
<p><strong>A Guide to Tubing Options at TAP Plastics</strong></p> <p>TAP Plastics carries a wide variety of tubing options for different applicatio
Plastic Materials on Rolls at TAP Plastics
<h1>A Guide to Plastic Materials on Rolls at TAP Plastics</h1> <p>TAP Plastics offers a wide variety of plastic materials on rolls, available by the foot, yard
Trade Show Essentials at TAP Plastics
<h1>Enhance Your Trade Show Display with TAP Plastics</h1> <p>A successful trade show display captures attention, showcases your brand, and leaves a lasting im
How to Work with Worbla
<h1><strong>Worbla: The Ultimate Thermoplastic for Cosplay, Crafting, and Model Making</strong></h1> <p>Worbla is a <strong>non-toxic thermop
Picture Frames and Display Holders
<h1><strong>Picture Frames & Display Holders at TAP Plastics</strong></h1> <p>TAP Plastics offers a wide variety of <strong>picture f
Adhesive Glues and Tapes
<p><strong>Your Guide to Choosing the Right Adhesive and Tape at TAP Plastics</strong></p> <p>When it comes to bonding different materials, choosin
Literature Holders at TAP Plastics
<p><strong>A Guide to Literature Holders from TAP Plastics</strong></p> <p>When it comes to organizing and displaying literature in a professional
Three Dimensional Signage with the Quick Snap System
<p><strong>How to Create Professional 3D Signs with the Quick Snap Letter System</strong></p> <p>Three-dimensional signs add depth and visual impac
The Basics of Fiberglass Fabric
<p><strong>A Comprehensive Guide to Fiberglass Fabric: Choosing the Right Reinforcement</strong></p> <h3>Introduction</h3> <p>Fiberg
Picture Framing Options at TAP Plastics
<p><strong>A Guide to Picture Framing Options at TAP Plastics</strong></p> <p>Framing pictures, posters, or menus doesn’t have to be limited to t
Introduction to Mold Making
<p><strong>A Guide to Choosing the Right Flexible Mold Material from TAP Plastics</strong></p> <p>When creating molds for casting, selecting the ri
Introduction to TAP Platinum Silicone
<p><strong>The Ultimate Guide to Mold Making with TAP Platinum Silicone</strong></p> <p>Mold making has never been easier with <a href="htt
