Wait, what mistakes is a laser actually showing you? It gives a perfect line to follow, not feedback on your hand movement. The skill is in the doing, not the aiming. @blake_black47 has a point about needing that "feel it out" practice. A tool doing the hard part for you doesn't build the same muscle memory. You learn more from fixing a wobbly cut freehand than from following a laser perfectly.

That Super 77 trick is a classic old-timer move. I see it all the time with old materials, like using hairspray to stop a nylon run or duct tape to temporarily fix a vinyl car seat tear. It's never the textbook fix, but it's the real world one that gets the job done when the proper stuff just won't stick.