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Toothpaste is not glue, and it's not particularly sticky.
I think you are seeing an air pressure effect. Assume a six inch
diameter funnel with a wall thickness of 1/16 inch. The area of the rim
that you are sealing up is over two square inches, which amounts to 30
pounds of air pressure - quite enough to support a plate.
I claim that in thin layers, the toothpaste exhibits tremendous
shear viscosity.
I disagree. Put some on the floor. It's like a banana peel - slippery.
You wouldn't want to walk down steps coated in toothpaste.
Anyway, that's a side issue. We're trying to figure out if it is an
adhesive or just a sealant. Someone needs to hang one thing from another
thing using toothpaste as the sealant, and put them in a vacuum bell to
see how much weight can be supported. I don't think it's much of an
adhesive.