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Scrub both surfaces with Ajax and an old toothbrush, then wash well under running hot water. This will dry almost instantly.
Use any slow setting epoxy on both surfaces. Clamp well - the springy metal paper clips are good for small stuff, otherwise use metal g-clamps.
Cure in a warm oven - about 80C. Use foil to prevent drips on oven floor. After a minute or two you can wipe off any excess epoxy while it is still liquid. Cure in oven for an hour.
Hot curing increases the strength and gets the job done quicker.
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