I cut recessed light holes in my ceilling. I was wondering if I can use anything to protect the rough inner edge of the cutout hole to protect drywall from chipping. Any ideas or suggestions?
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That is a pretty jagged cut but for the most part, it doesn't matter because the light trim will cover it up and chipping won't occur that far out. Try using a hack saw blade with 32 teeth per inch. You'll get a smoother cut. I use one with a handle similar to the one shown below. You can also get a hole saw but they're not cheap if you're only doing a few holes. If you're a real fanatic for smoothness, you can coat the inside edge with some drywall mud.
(Picture from Walmart.om)