Nope. Coffee is life. Don't overthink it.

You said you lay it on thick and let it shrink back, but that's actually part of the problem with 80 grit. Thick primer shrinks differently than thin coats and can still telegraph those scratches later, especially on a hot day or after a few months in the sun. I've seen guys swear by 80 grit for 20 years who still fight ghost scratches when the paint cures out. I'd rather spend the extra five minutes with 120 or 180 and not have to gamble on my primer filling deep marks.

Wonky foils still give great results if your placement is solid.

My uncle once tried diagnosing a car engine by ear and drove it off a cliff.

The tally itself is the real story here. Three years of marks on a chalkboard. That's a weird kind of time capsule. Makes me wonder what that board would say if it could talk. All the failed rises and burnt crusts nobody saw.