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Oogoo is a moldable homemade material made by mixing silicone caulk with cornstarch. It can be shaped by hand or pressed into a form, but it is a recipe—not a verified equivalent to Sugru. For a first try, make a small batch, follow the caulk manufacturer’s safety instructions, and test the mixture on a noncritical project.
What Oogoo is—and what it can do
Oogoo combines silicone caulk and cornstarch to make a material that can be molded by hand or cast in a form. WIRED quoted Oogoo inventor Michael Anthony describing it this way: “It can be used to make most of the things you can make with Sugru.” That is his description of the idea, not evidence that Oogoo matches Sugru’s adhesion, strength, durability, or safety for a particular use. (WIRED; Instructables)
Once cured, Oogoo can be sanded and cut with a knife, although the WIRED instructions caution that precise knife cuts are difficult. Treat it as a craft or prototyping material unless the exact caulk and resulting piece have been established as suitable for a more demanding purpose.
What you need
- 100% silicone caulk. The original tutorial specifies 100% clear silicone caulk; formulations differ, so check the specific product label.
- 100% cornstarch.
- A caulking gun if the caulk comes in a cartridge.
- A disposable cup or other container and a mixing stick, such as a lollipop stick.
- Nitrile gloves and a well-ventilated workspace. The product label and current safety data sheet take precedence over general recipe advice.
WIRED’s materials list also mentions linseed-oil-based paint for coloring. It describes adding five drops per teaspoon of mixture, but that is a reported recipe instruction, not a guarantee that the paint is compatible with every caulk. (WIRED; Instructables)
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LET'S RESIN Silicone Mold Making Kit-Translucent Silicone Rubber 20oz
- PREMIUM MOLDS MAKING SILICONE MATERIAL: Our translucent liquid silicone for mold making are platinum-cured silicone, made by safe silicone material, non-toxic and no odor, very flexible, soft and clear. You could also mix mold making silicone rubber with mica powder to create new colors.
- EASY MIXING & POURING: This silicone molds making kit includes part A and part B, the mix ratio is 1:1 by weight. Pour the Part A and Part B together, then stir the silicone rubber for 5 minutes, make sure to stir the liquid siicone rubber mixture thoroughly for better results. The working time is 30 minutes at room temperature.
- NO BUBBLES: The bubbles of liquid silicone will automatically disappear within 2 hours, no vacuum degassing is necessary. The working time of making mold kit is 40 minutes at room temperature and the complete cure time is at least 4 hours at room temperature, it varies on your mold size and thickness. If it's little sticky, please extend the curing time of silicone rubber
- GREAT FOR BEGINNER: If you're new to the mold making, this mold making kit is a perfect choice for you to try! No special skills or tools are needed. You could enjoy this fun and creative activity all day. HOW to CLEAN: If there's any spill, please clean with soapy water or rubbing alcohol.
- FAST CURE &100% REDUCTION: 4 hours fast cure, 15A hardness, so that the finished mold produced has good flexibility and elasticity, not easy to tear. It can capture complex details well and release mold easily.
How to mix a small batch
- Read the caulk label and safety data sheet. Uncured caulk can give off fumes. WIRED recommends gloves and good ventilation; a University of Akron classroom handout measures silicone-1 caulk in a fume hood. Use the precautions specified for your product. (WIRED; University of Akron Polymer Outreach)
- Dispense only a small amount of caulk. WIRED suggests starting with around three or four tablespoons. This is a practical recipe suggestion, not a standardized batch size.
- Add cornstarch and mix. WIRED reports a cornstarch-to-silicone ratio of 1:1 for a quicker set, or 1:3 for a slower set over a few hours. These are reported recipe ratios rather than guaranteed working or curing times. Mix in small quantities and be prepared to adjust your approach for the particular caulk and conditions.
- Shape or cast the mixture. Work it by hand or press it into a form while it is workable. Avoid skin contact with uncured caulk and keep the workspace ventilated.
- Allow it to cure before handling as a finished part. Do not assume a fixed cure time from the ratios alone. Temperature, humidity, thickness, and mixing can affect the result. (Instructables)
Why timing and results vary
The quicker- and slower-set ratios above are guidance from WIRED’s 2015 recipe, not product specifications. The original tutorial identifies temperature, humidity, thickness, and mixing as factors affecting cure time. It also reports that the particular vinegar-smelling caulk used in that tutorial worked and that a named newer formulation did not. That old, recipe-specific observation does not establish how currently sold caulks compare or which will work best.
The original tutorial proposes an explanation for why cornstarch accelerates curing, but Make: expressed uncertainty about that explanation. The practical takeaway is to judge the result by the specific mixture and caulk rather than relying on a presumed chemical mechanism. (Make:)
Rank #2
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LET'S RESIN Silicone Mold Making Kit Liquid Silicone Rubber 140oz/1 Gallon
- PREMIUM MOLDS MAKING SILICONE MATERIAL: Our translucent liquid silicone for mold making are platinum-cured silicone, made by safe silicone material, non-toxic and no odor, very flexible, soft and clear. You could also mix mold making silicone rubber with mica powder to create new colors
- EASY MIXING & POURING: This silicone molds making kit includes part A and part B, the mix ratio is 1:1 by weight. Pour the Part A and Part B together, then stir the silicone rubber for 5 minutes, make sure to stir the silicone rubber mixture thoroughly for better results. The working time is 5 minutes at room temperature
- NO BUBBLES: The bubbles of liquid silicone will automatically disappear within 2 hours, no vacuum degassing is necessary. The working time of making mold kit is 5 minutes at room temperature and the complete cure time is at least 6-12 hours at room temperature, it varies on your mold size and thickness. If it's s little sticky, please extend the curing time of silicone rubber
- GREAT FOR BEGINNER: If you're new to the mold making, this mold making kit is a perfect choice for you to try! No special skills or tools are needed. You could enjoy this fun and creative activity all day. HOW to CLEAN: If there's any spill, please clean with soapy water or rubbing alcohol
- WIDE APPLICATION: It's very ideal for art craft use, DIY your own resin molds, wax molds, candle molds, soap molds, use to make silicone molds for resin casting, wax, candle,soap making, etc. If you have any question with LET'S RESIN molding silicone kit, please don't hesitate to contact us
Oogoo and Sugru: what can be compared
| Aspect | Oogoo | Sugru |
|---|---|---|
| Ingredients and preparation | Homemade mixture of silicone caulk and cornstarch; mixed before shaping. (Instructables) | Not stated in the cited sources. |
| Working and cure guidance | WIRED reports 1:1 cornstarch-to-silicone for a quick set and 1:3 for a slower set over a few hours; actual timing varies. (WIRED) | Not stated in the cited sources. |
| Shaping | Can be hand-molded or used in a form. (Instructables) | Not stated in the cited sources. |
| Comparative performance and intended exposures | Comparative adhesion, strength, service life, and suitability for food contact or prolonged skin contact are not established by these sources. | Comparative performance and exposure suitability are not established by these sources. |
This comparison is limited to what the cited instructions establish; it is not a product test. Before choosing either material for a repair or an exposure-sensitive use, consult the documentation for the specific product and application.
Quick Recap
Best Value
CHANGTIKEJI Silicone Mold Making Kit,64OZ Super Elastic Liquid Silicone for Mold Maker, Fast Cure Translucent Silicone Rubber for Casting Resins Mold,Silicone Mold,Candle Mold,Soap Mold,Food Mold
- 【64oz Mold Making Kit】: This silicone mold making kit comes with 2 bottles of liquid silicone, each bottle containing 32oz of platinum cure silicone, as well as 5pcs wooden mixing sticks,6pcs disposable protective gloves; a perfect slicone mold kit for beginners to try, satisfying your various needs.
- 【Premium Silicone Materials】: The silicone mold finished with food grade silicone rubber features highly elastic and excellent flexibility, this silicone hardness:10A，and can be replicated accurately down to the tiniest details, great for making 3D silicone molds or flat resin molds. And due to its excellent elasticity, you can easily de-mold the items from the 3D silicone molds without cutting them out.
- 【No Bubbles】: No vacuum degassing is necessary! The bubbles of silicone for mold making will automatically disappear within 1.5 hours at room temperature due to its low viscosity(viscosity 1500) feature.
- 【Easy To Blend & Fast Curing】：This silicone molds making kit includes part A and part B with mix ratio is 1:1 by weight or volume. Just pour the equal Part A and Part B together, then Stir evenly， the working time is within 40 minutes and the cure time is 2~ 4 hours at room 22℃（71.6℉) temperature. The final curing time varies on your molds size and thickness and the curing temperature.A high ambient temperature will shorten the curing time, and vice versa.
- 【Wide Application & Long Shelf Life】: CHANGTIKEJI high-performance liquid silicone is widely used for mold making of arts crafts, like casting Resins, Wax, Gypsum, Concrete, Soap, Candle and also can be used as Molds Making for Candy, Chocolate, Cake and Ice Cubes.Our liquid silicone has a very long shelf life of over 1 year.
Rank #4
LET'S RESIN 8oz Silicone Mold Making Kit, Fast Cure Liquid Silicone Rubber
- 【All in One Silicone Kit】: This starter kit comes with 8oz silicone rubber, stirring wood sticks x 2 pcs, 100ml plastic measuring cups x 2 pcs; disposable plastic gloves x 2 pcs; If you're new to silicone mold-making and afraid to fail, LET'S RESIN silicone mold making trial kit is a perfect choice for you to try without costing you a lot, provide everything that you need to get started.
- 【Fast Cure & No Bubbles】:This mold making silicone rubber cures at room temperature or can be heated to cure faster. It has 30~40min working time and cures in 3-6h at room temperature 73.4℉/25℃, varying with your mold size and thickness..The bubbles will automatically disappear within 2 hours due to its excellent low viscosity feature, no vacuum degassing is necessary.
- 【Premium Mold Making Silicone Materials】: Our liquid silicone for mold making is platinum-cured silicone, non-toxic and odorless, with negligible shrinkage, designed for making excellent flexibility and high tear resistance silicone molds; meaning it will last years if taken care of properly.
- 【Easy Mixing & Pouring】: This silicone molds making kit includes part A and part B with mix ratio 1:1 by weight; Pour the equal Part A and Part B together, then stir the silicone rubber for 3 minutes, very easy to use, no special skills or tools are needed; make sure to scrape the bottom and the sidewalls of the mixing cup to ensure thoroughly mixed.
- 【Wide Application】: LET'S RESIN high-performance mold making silicone rubber is idea for making highly-detailed molds as well as 3D silicone molds; very ideal for art craft use, casting material like resin, wax, gypsum, soap, candle, polymer clay, easily make your own silicone molds. Translucent clear color allow you to mix with mica powder, chameleon powder, and even glow-in-the-dark pigment to create a unique color shade and offer you more DIY fun.
Rank #3
Silicone Mold Making Kit 66 oz SHORE RESIN, 15A Platinum Silicone Rubber
- 1️⃣ 66 OZ FOR LARGER MOLDS & MULTIPLE PROJECTS — Includes 33 oz Part A + 33 oz Part B for larger molds, multiple small molds and repeat making. Suitable for resin casting, candle and wax, soap, plaster, clay, concrete and craft mold projects.
- EASY 1:1 TWO-PART SILICONE MIX — Mix equal parts A and B by weight or volume and stir thoroughly for 3–5 minutes. About 30 minutes of working time at 77°F/25°C gives more time to pour, position originals and fill detailed shapes.
- LOW-VISCOSITY LIQUID SILICONE FOR MOLDS — Smooth-flowing platinum-cure silicone reaches narrow details and intricate textures while helping trapped air rise naturally. Slow mixing and thin-stream pouring can help create cleaner molds.
- FLEXIBLE 15A SILICONE RUBBER FOR MOLD MAKING — Shore A 15 provides a practical balance of softness, flexibility and tear resistance. Cured molds bend around undercuts for easier demolding while preserving fine detail through repeat casting projects.
- 4-HOUR INITIAL ROOM-TEMPERATURE CURE — At about 77°F/25°C, initial cure is around 4 hours and full cure typically takes 4–6 hours. Larger molds, thicker pours or cooler rooms may require more time before demolding.
Uses to avoid without product-specific evidence
- Food contact: The cited instructions do not establish Oogoo as food-safe.
- Prolonged skin contact: The sources do not establish it as skin-safe. Handling uncured caulk also requires attention to the manufacturer’s warnings.
- Safety-critical repairs: The available sources provide no validated performance testing for structural, electrical, plumbing, or other safety-critical repairs. Do not rely on a homemade batch for a repair where failure could cause injury or damage.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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