I want to make a silicone cup that is flexible, is this stuff capable

This stuff would work with the right mold, however, I'm not sure it's really food safe. That's mighty important if you're ever going to use it to drink with. I was using it for Jewelry stuff so I didn't need to worry about that part. There's a lot of silicone cups that hikers use. I'd search that out if you only want to make for you. if you're wanting to go into production, contact the company itself. That's the only safe way. Good luck whichever way to go.

Using a plaster mold, what do I coat the inside with? Also does it come out flexible or a hard plastic? Thanks

This makes a solid rubber but is mainly used to make the mold, not to pour in... As a mold, it is superb because nothing sticks to it ( you can use PAM spray if you need to). But if you pour it into your plaster mold, it may stick or come out sticky... There is a release gel to paint in for rubber if you can find it, comes in a can (flamable). If you want a hard plastic material or a foam, there are better and cheaper products. You will always want to use a release spray for these.

I read on some reviews that you need a drying chamber or does this cure at room temperature without the use of any other machinery?

The material I used cured fine for the purpose I needed at room temperature in air. When working with the product you may entrap air bubbles if not careful and these could be removed with a pressure pot. The casting I was replicating was too large to contain in this way.

Can i use this for cold casting metal?

no but i do have a product called cast-a-mold platinum which has a heat deflection of 400 f

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SRC Cast-a-Mold 25T RTV 1 Gallon, General Purpose Silicone

Product ID: 5597191

Details

Material
Silicone
Color
Green
Brand
SPRESIN
Item dimensions L x W x H
10 x 10 x 10
Shape
Rectangular

🔥Heat-resistant silicone

♻️Reusable durable molds

⚖️Precision mix by weight

€ 422.37

Duties & taxes included

In stock

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Description

⚡ Mold your masterpiece with precision and durability!

HEAT RESISTANT FLEXIBILITY - Craft molds that withstand high temperatures without losing detail or shape.
EXCEPTIONAL TEAR RESISTANCE - Bend and release your castings effortlessly without compromising mold integrity.
PROUDLY AMERICAN MADE QUALITY - Crafted in the USA for reliable, premium-grade silicone molding every project deserves.
VERSATILE CASTING COMPATIBILITY - Ideal for epoxy, concrete, soap, wax, plaster, and more—one kit, endless creativity.
PRECISION MIXING FOR FLAWLESS RESULTS - Mix by weight with ease to unlock perfect mold consistency every time.

SPRESIN Cast-A-Mold 25T is a premium, tin-cured RTV silicone rubber mold-making kit designed for professional-quality, heat-resistant, and reusable molds. Perfect for casting a wide range of materials including epoxy resin, concrete, soap, and wax, it ensures detailed, tear-resistant molds with easy release. Made in the USA, this 1-gallon kit is favored by artists and crafters seeking precision and durability in their mold-making projects.

Specifications

ASIN	B008UVMWKC
Best Sellers Rank	#143,392 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #1,023 in Sculpture Molding & Casting Products
Brand	SPRESIN
Brand Name	SPRESIN
Color	Green
Customer Reviews	4.4 out of 5 stars 282 Reviews
Item Dimensions	10 x 10 x 10 inches
Item Highlight	Liquid Silicone Rubber Mold Making Kit, Perfect for Jewelry Making, Casting Epoxy Resin, Soap, Plaster, Cement, & Concrete
Item Weight	10 pounds
Item dimensions L x W x H	10 x 10 x 10 inches
Manufacturer	Specialty Resin & Chemical
Manufacturer Part Number	Rtv Silicone Rubber (1 Gallon)
Material	Silicone
Material Type	Silicone
Model Number	Rtv Silcone Rubber (1 Gallon)
Number of Items	1
Number of Pieces	1
Shape	Rectangular
UPC	661799648653
Unit Count	1 Count

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