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 Silicone Mold Making Rubber - Trial Unit

Product ID: 256679582

Details

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

⏳6-hour cure time

🔥Heat resistant up to 450°F

⚖️1:1 mix ratio, easy precision

RM444

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Description

🔥 Mold like a pro, last like a legend!

NO VACUUM NEEDED - Skip expensive degassing equipment and speed up your workflow.
EFFORTLESS MIXING - 1:1 ratio means no guesswork, perfect for busy pros.
VERSATILE CASTING - Ideal for wax, gypsum, resins, concrete & more—expand your creative toolkit.
HIGH HEAT TOLERANCE - Cast low-temp metals confidently with 450°F resistance.
DURABLE TEAR RESISTANT - Craft molds that withstand repeated use without wear.

Smooth-On Mold Star 30 is a platinum silicone rubber that cures to a durable, tear-resistant mold with a Shore hardness of 30A. It offers a 1:1 mix ratio, 6-hour cure time, and heat resistance up to 450°F, making it perfect for casting wax, gypsum, resins, concrete, and low-temperature metals without the need for vacuum degassing.

Specifications

ASIN	B00ETAY8RI
Brand Name	Smooth-On
Color	Blue
Customer Reviews	4.6 4.6 out of 5 stars (702)
Item Dimensions	19.1 x 15.2 x 7.6 centimeters
Item Highlight	Long-Lasting Silicone Mold
Item Weight	1.12 kg
Manufacturer	Smooth-On
Manufacturer Part Number	moldstar30
Material Type	Silicone
Model Number	COMINHKR067156
Number of Items	1
Number of Pieces	1
Shape	Star
UPC	751635227415
Unit Count	1 Count

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RM444

Duties & taxes included

In stock

Sold byAmazon MalaysiaDelivered 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 Malaysia.

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TrustScore 4.5 | 7,300+ reviews

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