Polyurethane Casting System A60 Flexible Set gives a nice flexible rubber like cast with high tear strength.
Flex-It 90, Specialty Resin
Platinum Cure Silicone Rubber Semi-Rigid Mold
Flexible High Impact Cast Urethane (Shore 30 D) – Pollinator® Kit
Semi Flexible Casting Polyurethane Resin (Shore A 90 ,A 60 Mixing
LET'S RESIN Polyurethane Resin, 60oz 2 Part Casting
Semi Flexible Casting Polyurethane Resin (Shore A 90 ,A 60 mixing
Envirolastomer ELA1060 - Environmentally Friendly Polyurethane Casting Resin - 60 Shore A Hardness - (4 lb Kit (64 oz Kit))
This 60 Shore D hardness Urethane Casting Resin is well suited for demanding industrial applications. Extremely tough, this urethane casting resin system exhibits very high tensile and tear strength, excellent elongation, and good abrasion resistance. Easily pour this amber, lower viscosity material in open casts and closed molds to produce incredibly durable foundry tools, patterns, or parts.When mixed thoroughly, pour the urethane slowly to aid the release of air bubbles.
Fibre Glast Urethane Casting Resin- 60 Shore D Gallon Kit
Polytek Poly PT Flex 60 Fast Cure A60 Polyurethane Casting Rubber
Enduro Flex - Flexible Resin - 7 Minute Work Time
Clear Epoxy Resins
ArtKast Brushable Resin - All Kit Sizes
Enduro Soft - 2 Part Liquid Polyurethane Casting Rubber - Durable, Rubber Casting Resin - Soft Rubber Feel (2 lb kit (32 oz kit))
Let's Resin 60oz Polyurethane Resin, Fast Cured Resin Within 10 Minutes