Can I add glitter to this?

I've used 325 with glitter pigments, and it works very well. You'll have to add a decent amount of glitter and it will take longer to cure.

Can I use this to cast a dome-shaped mask using a silicone mold? Will it stay liquid long enough for me to tilt it back & forth to form an even coat?

Smooth-Cast 300 is a snap cure material - a better choice may be Smooth-Cast 325 or Smooth-Cast 65D, both of which have a gradual cure profile.

Yeah, to an extent. I’ve taken a dremle tool to casted plastic to sand down parts and remove unwanted flashing that occurs. It’s pretty tough stuff, let it cure for a day or two before sanding or working on thinner areas, but I’ve even taken a hacksaw to some castings and they have held up just fine.

Manufacturer	Smooth-On, Inc.
Part Number	47641
Product Dimensions	18.8 x 15.24 x 7.87 cm; 907.18 g
Item model number	47641
Size	Trial Unit
Colour	White
Material	Urethane
Item Package Quantity	1
Grit Number	300
Grit Description	Fine
Batteries included?	No
Batteries Required?	No
Item Weight	907 g

Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit

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