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Posca pens are awesome...plain & simple. I will re-interate what someone else said about using ANY kind of paint pen because I think this is invaluable information. PAINT PENS LEAK IF NOT STARTED PROPERLY!!!! Many people complain of paint pens leaking big blobs after the fist couple of uses. It's a real issue! Here's the trick (at least as far as I know)... SHAKE THE PEN LIKE CRAZY. HOLD THE PEN UPRIGHT . PUT IT UP TO YOUR EAR, THEN HOLD DOWN THE NIB WITH YOUR FINGER TIP OR FINGER NAIL. YOU WILL HEAR A LITTLE CLICK & HISS. HOLD IT DOWN FOR 10 SECONDS. (Yes, count to 10 SLOWLY.) THEN FLIP THE PEN AND VERY GRADUALLY WORK THE PAINT INTO THE FRESH NIB BY PRESSING DOWN HALF WAY. BE GENTLE. BE PATIENT. LITTLE PRESSES UNTIL YOU SEE THE PAINT HAS FILLED THE NIB AND PAINT IS SHOWING UP FULL COLOR ON YOUR PAPER. Voila! That is it. Now the pen shouldn't "blob"!