Option 2 has always worked perfectly fine for me with non-fiberglass specific hole saws. I forget the brand, but I use the generic ones from Home Depot or Lowes. I've done about 5 or so holes with hole saws like this and never had any chipping at all. Nice and clean. Just make sure you are perpendicular to the surface, go easy, and as already stated, use some tape and go in reverse so it doesn't bite. I know it's one of those scary things that some people just don't want to do, especially for overflows that are on the side of the boat and will be visible. If you aren't confident, pay someone else to do it so you can blame the outcome on them and not kick yourself if you screw it up. Honestly, I'd be more concerned about the placement of the hole. That's where I get nervous. Your eye can pick up the slightest error, and measuring doesn't always look right...sometimes you gotta just go with what looks centered or lined up or straight. Not sure if you will be putting more than 1 or trying to land in line with an existing one, so maybe this is not relevant. Danny
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