If you're doing it with the casing still on the bike (i.e. emergency / quick fix), just lay the bike on it's side; scratch out the crack to a "V" (a fllat-head screwdriver does a good job), rough up the area either side of the crack and then degrease with whatever you can find (meths, thinners, vodka, etc) fill the crack with JB Weld or similar and wait for it to go off.
If you actually hole a casing, the same method applies just that you will need a patch. Coins work quite well.
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