What can I use to droop thesis? on walls without taking bad the paint??

on walls without taking bad the paint??
My end ask isnt showing up.so can someone...
Answers:    Plain white toothpaste (not gel) works quite okay. Or you can buy some stuff that looks like blue or pink gum. I contemplate Office Depot carries it.
How much to allow for an external wall?
Sticky tack
:D
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