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

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

⏳45 min pot life, 6 hr cure time

🔥Heat resistant up to 450°F

🛡️Tear resistant & low shrinkage

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428 zł

Duties & taxes included

In stock

Sold byAmazon PolandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Mold like a pro, cast like a visionary!

DURABILITY THAT LASTS - Tear-resistant silicone ensures your molds stay strong through countless uses.
PRECISION MOLD MASTERY - Captures ultra-fine detail for flawless casts every time.
EFFORTLESS MIXING USE - 1:1 mix ratio with no vacuum degassing needed—simplicity meets efficiency.
HEAT DEFYING PERFORMANCE - Withstands up to 450°F, perfect for low-temp metal casting and more.
VERSATILE CASTING COMPATIBILITY - Ideal for wax, gypsum, resins, concrete, and low-temp metal alloys.

Smooth-On Mold Star 30 is a platinum silicone mold-making rubber that cures to a durable, tear-resistant, and heat-resistant (up to 450°F) soft rubber. With a balanced 1:1 mix ratio, 45-minute pot life, and 6-hour cure time, it delivers high-detail molds ideal for casting wax, gypsum, resins, concrete, and low-temperature metal alloys—no vacuum degassing required.

Specifications

ASIN	B00ETAY8RI
Brand Name	Smooth-On
Color	Blue
Customer Reviews	4.6 4.6 out of 5 stars (698)
Item Dimensions	19.1 x 15.2 x 7.6 centimeters
Item Weight	0.59 Kilograms
Manufacturer	Smooth-On
Manufacturer Part Number	moldstar30
Material Type	Silicone
Model Number	COMINHKR067156
Number of Pieces	1
Shape	Star
UPC	751635227415
Unit Count	1 Count

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