Yo, I won't flannel, I am a quite inexperienced guy on the scene. I've got this problem where some of my cans are straight up clogged and won't spray even a bit of paint. I sometimes keep them for a long time before really making use of them or keep them in a cold place so this may be the case. Shaking them all the way up and down before using and always using fresh caps, they just won't shoot a bit as if the valve got stuck. When this happens I try couple caps and shaking upside down but nothing helps. Once I got this with 2x600's and I replaced them at the store. Anyone got any tips or reasons for that? Ty all.