Saw blade got hot and melted the backing, here's what saved the job

Last week in Tucson I was trimming carpet around a curved staircase and my utility knife blade was dragging. It got so hot the glue on the backing melted and left a sticky mess on the blade, then it started tearing the carpet fibers instead of cutting clean. I stopped, grabbed a spray bottle with water, cooled the blade down, and wiped it with a dry rag. That worked but only for about 15 minutes before it heated up again. What actually fixed it was switching to a fresh blade every two cuts and keeping the blade angle lower, around 20 degrees instead of 45. Any of you guys run into this on tight curves, or do you just go straight to a power stretcher and hope for the best?

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