Does this dry transparent?

No, it does blend well with paint.

Does this stick to artist's canvas to be painted?

Yes, after applying gesso to canvas, then it will stick and can be painted over for a textured look.

Is the dried product waterproof?

Impervious. That is you can paint it with water soluble paint without doing any immediate structural damage.

Could I put this in a pastry bag with icing tips to decorate a fake cake? Is there something cheaper/ better to decorate a fake cake with star tip,etc

I'm sure this can be used in cake bags. The consistency is very thick, might not be very "sharp" Also can try a clay compound, or plaster mix. The modeling paste dries best.

Brand	U.S. Art Supply
Item Form	Paste
Special Feature	Non Toxic
Item Package Quantity	1
Package Information	Pail
Item Volume	500 Millilitres
Net Quantity	500.0 Milliliters
UPC	848849003857
Global Trade Identification Number	00848849003857
Manufacturer	U.S. Art Supply
Item model number	AM-5041-500
ASIN	B07GYZ19DW

U.S. Art Supply Modeling Paste Acrylic Medium, 500ml Tub

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