Are there any good 2 gallon tank sprayers that are suitable for homeowner use? I have tried a couple over the last few years and they really haven't been too good. They work ok at first, then the spray pattern gets erratic and it seems like I have to fiddle with the nozzle frequently to get it spray properly. I also notice slight air leakage from the top of my current sprayer, which is supposedly an RL Flowmaster commercial quality unit that I bought at Home Depot. It is definitely better than the WalMart variety, but it still leaves a lot to be desired. I am using it for brush and lawn weed control. Any info or suggestions will be most appreciated. Thanks.