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I just used this to fill tubes with homemade mascara and I am very impressed. I included a couple photos, even though the tube was full at the start you can see there's not so much as a streak left inside once I pressed down on the plunger. I was able to cut the additional tube to exactly the right length and voila. It wasn't easy to push down on the plunger, I had to REALLY push it against my knee but heck I'd rather that than have it dribble all over like using a frosting applicator, my kitchen looked like all the chimney sweeps from Mary Poppins danced through it after that fiasco. I imagine it took more force because I was pushing a viscous fluid through, because once I filled it with water to clean it out it pushed down easily but still very cleanly. Cleaned in a flash! Look at these beauties!