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[–] CallingOutLefty 0 points 2 points (+2|-0) ago 

So that the paste doesn't get crusty and cement itself into the tube, exploding in your face the next time you try to use it.

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[–] MetalAegis [S] 1 point 0 points (+1|-1) ago  (edited ago)

"Hmm.. I'm squeezing the tube but nothing appears to be happening, perhaps I'll use my eye to see if I can detect what the issue is.. now that I can see see directly into the nozzle I'll apply large amounts of pressure so that I can observ...AARG MY EYE!"