What if the timing problem isn't always about the clock? How the hair reacts and the client's goal can change the outcome too. Sticking only to a schedule might not address the real issue.

Honestly... how much of a difference does it really make once the primer and paint go on? That extra hour of block sanding seems like overkill for something nobody will ever touch or look at that close. Most home owners just see a smooth coat of paint, not the grit you used to get there.

Seriously though, what makes people skip the warning even when they know they should use it?

My buddy used to complain about his veggies getting soggy until he tried the cornstarch trick. He won't shut up about how crispy they are now.

My buddy actually tried the phone app thing the_karen mentioned last year when his vintage amp was acting up. The app kept clipping and he couldn't get a clean sine wave to save his life. He ended up borrowing an old HP 3312A function generator from his uncle's garage. That thing was a tank, but it gave him the stable signal he needed to trace the problem. Sometimes the simple fix works, but his project needed the real tool.