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 Kit - Easy to Use & Long-Lasting Silicone Mold (2-Pound)

Smooth-On Mold Star 30 Silicone Mold Making Kit - Easy to Use & Long-Lasting Silicone Mold (2-Pound)

Product ID: 5665350

Details

Brand
Smooth-On
Color
Blue
Item dimensions L x W x H
7.52 x 5.98 x
Material
Silicone
Shape
Star

🔥Heat resistant up to 450°F

🕒6 min pot life & 30 min cure

⚖️1:1 mix ratio, no scale needed

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€ 94.91

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Mold like a pro, fast and flawless every time!

DURABLE FLEXIBLE - Tear-resistant, soft silicone molds that last through countless casts without shrinking.
BUBBLE FREE RESULTS - Low viscosity formula minimizes air bubbles—vacuum degassing optional for flawless detail.
RAPID MOLD CREATION - Fast 6-minute pot life and 30-minute cure time keep your projects moving at lightning speed.
HEAT RESISTANT VERSATILITY - Withstands up to 450°F, ideal for low-temp metal casting and diverse materials.
EFFORTLESS PRECISION MIXING - One-to-one volume ratio means no scales, no stress—perfect for busy pros.

Mold Star 30 is a professional-grade platinum silicone mold-making kit featuring a user-friendly 1:1 mix ratio, rapid curing in just 30 minutes, and exceptional tear resistance. Its heat tolerance up to 450°F and low shrinkage make it perfect for casting wax, gypsum, resins, and low-temp metals. Designed for both beginners and experts, it delivers detailed, durable molds with minimal bubbles and no vacuum degassing required.

Specifications

ASIN	B00ETAY8RI
Best Sellers Rank	#12,975 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #123 in Sculpture Molding & Casting Products
Brand Name	Smooth-On
Color	Blue
Customer Reviews	4.6 4.6 out of 5 stars (743)
Item Dimensions	7.52 x 5.98 x 2.99 inches
Item Weight	0.59 Kilograms
Manufacturer	Smooth-On, Inc.
Manufacturer Part Number	moldstar30
Material Type	Silicone
Model Number	COMINHKR067156
Number of Pieces	1
Shape	Star
UPC	751635227415
Unit Count	1.0 Count
Warranty Description	No Warranty

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