That dew point thing is real and people sleep on it. Night before wash is smart but you also want to think about where the car sits overnight. I park in a garage so I'm fine, but my buddy leaves his M3 outside and even after a full wash he gets spotting by 7am because the dew lands on the panels and then the sun hits it sideways. Now he throws a cover on after drying and pulls it off right before he leaves. The cover keeps the dew off the paint completely.

That imager was the best money I ever spent on the bench. It found a bad mosfet on a laptop board in like thirty seconds when I would have been poking around for an hour. Once you see a hot spot light up on screen you never go back to guessing.

Man, I used to be the guy who followed the mixing chart like it was gospel. I'd top off my sump and dump in whatever the sheet said, then wonder why my taps kept snapping or my finish looked like garbage. Then an old machinist at a shop in my town told me the chart is just a starting point and your water hardness and what you're cutting changes everything. Started checking with a refractometer every week and bumping it up or down based on how the chips were flying and the tool life. Now I run closer to 7 or 8 percent on my aluminum jobs instead of the 10 or 12 the book wanted and my end mills last way longer. Wild how much money you save just by trusting the gauge over the paper.