whats the difference between oomo 30 and moldstar ?

OOMOO 30 has a Shore hardness rating of 00-30, which is about as squishy as a gel shoe insert. Moldstar 30 is a hardness of Shore A-30, which is closer to pencil eraser hardness. It’s confusing, but there are 2 Shore hardness scales and a 30 on one is very different from a 30 on the other. In the description when it talks about hardness, pay attention to whether it says Shore A or Shore 00.

What color is this silicone? Can I use mica powders to color it

It is blue when mixed, and very opaque, so I doubt powders will be able to color it much if at all. If you're looking to label your molds, I've 3D printed mirrored text using a raft, and set it into the mixed material. It floats, and pulls away cleanly once the material is cured. If you want a platinum cure 2 part silicone around shore-A 30 you can color, I might suggest DragonSkin 30 or Platsil Gel-25.

Hi. i've made a wax mold of a small animal bone using this silicone method. i'm curious if i can use clay as well. i'm looking to make jewelry..

On Smooth On's website it states that this line of mold will not work with modeling clays that contain sulfur. Their website was very helpful and has lots of information: http://www.smooth-on.com/Silicone-Rubber-an/c2_1115_1341/index.html

No. Smooth On does however make a food safe silicone called Smooth -Sil 940

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Smooth-On Mold Star 30 Mouldmaking Silicone Rubber - Trial Unit

Product ID: 48207962

Details

Brand
Smooth-On
Colour
Blue
Item dimensions L x W x H
19.1 x 15.2 x
Material
Silicone
Shape
Star

⏳45 min pot life

🔥Heat resistant to 450°F

🛡️30A Shore hardness

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Description

🛠️ Mold like a pro, cast like a visionary!

OPTIMIZED WORKFLOW - 1:1 mix ratio and 45-minute pot life give you ample time to work without rush or waste.
EFFORTLESS PRECISION - Platinum silicone formula captures every detail flawlessly for professional-grade molds.
VERSATILE CASTING POWER - Perfectly compatible with wax, gypsum, resins, concrete, and more—expand your creative horizons.
HEAT RESISTANT RELIABILITY - Withstands up to 450°F, making it ideal for demanding projects that require thermal endurance.
DURABILITY MEETS FLEXIBILITY - Soft yet tear-resistant rubber ensures your molds last through countless casts without compromise.

Smooth-On Mold Star 30 is a premium platinum silicone rubber designed for easy mixing and exceptional durability. With a balanced 1:1 volume mix ratio, a generous 45-minute pot life, and a 6-hour cure time, it produces soft yet strong molds with 30A Shore hardness. Heat resistant up to 450°F and tear-resistant, it’s perfect for casting a wide range of materials including wax, gypsum, resins, and concrete—ideal for professionals seeking reliable, high-detail moldmaking without vacuum degassing.

Specifications

ASIN	B00ETAY8RI
Best Sellers Rank	515,245 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 1,508 in Sculpting Moulding & Casting
Brand Name	Smooth-On
Colour	Blue
Country Of Origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (705)
Item Dimensions	19.1 x 15.2 x 7.6 centimetres
Item Shape	Star
Item Weight	2.47 Pounds
Manufacturer	Smooth-On
Manufacturer Part Number	moldstar30
Material Type	Silicone
Model Number	COMINHKR067156
Number of Items	1
Number of Packs	1
Number of Pieces	1
UPC	751635227415
Unit Count	1.0 count

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C$9361

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In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

Secure transaction

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