I just got a new PG Magnum, Doing the first round of applications, Dimension+fert, Lime, and spraying three way. This is the first time using the PG and actually spraying Three way. PG worked fine the first day. Hosed it off and sprayed everything out of the tank. Day two the sprayer valve started to stick and remain stuck on. So Pulled off the gaurds and hosed out everything good(lime seems to get everywhere) put a lil oil on the valve to lube up the little area that makes contact. Still the valve sticks. I mean it is hard to move by hand. So I took it off cleaned off the seals and ran a little water on them. Valve still sticks. I was wondering if you need lube the seals up with anything? manual doesn't say anything about this. I'm assuming you need to flush out the spray system everynight? I've pretty much only used backpack sprayers to this point and never have had aproblem with momentum or octane, manage gunking up the sprayer seals. Even if I left mix over night or longer. Lesco rep didn't say anything about flushing out the system everynight nor did manual.