I have been using this sprayer now for a few months, with all sorts of fluids (deer repellent, insect repellent, mildew control solution...) and it still works great. I previously had a larger one (2 gal.) that became unusable after filling it only 2/3 times with deer repellent solution, but this one never clogs up (provided that you rinse it after use and let it open to dry up).