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My dry vac pump has about 650 hours on it. No signs of failure, but there is some opinion out there that after 500 hours one is living on borrowed time with one of those. I have a backup pump, but I'm wodering what the consensus is on just replacing the main pump before the inevitable failure...

I carry a couple of bottles of isopropyl alcohol plus a hand-sprayer in my plane for defrosting the wings and horiz stabilizer in winter when I wind up tying down at an airport overnight. Although it works well, I wonder if it is harmful or otherwise not a good idea. I would appreciate any...