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I usually have a hose dribbling water into the cut. It's really messy, but so much more preferable to spaffing concrete dust everywhere.
I score a line first, then go deep (I'm usually just making rough holes / channels though).
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Cut them wet but if it's not a dedicated wet cutter depends how many you have to do before you'll kill it. A normal cutter will survive a fair amount of water though, usually from a hose but a watering can will do. Helps if you have 2 people.
NotThamesWater
Airhead
@moocher
I'm going to be cutting through paving slabs with an angle grinder, with the appropriate disc.
Ear, eye and breathing protection.
What else? Should I keep the slabs/blade wet to reduce dust/heat?
Should I make several shallow passes or go deep straight off?