Just sticking FibaTape over the crack and concealing with joint compound may work, but most likely the crack will return to some degree. Creating a V groove along the crack will allow you to actually fill in the crack and repair deep into the crack. The extreme cracks should be covered with Extra Strength FibaTape. The tape can be applied over the V groove and when compound is applied make sure to apply enough pressure with the taping knife to force compound through the tape filling the V groove. You could also prefill with compound and cover with the tape. Perfect Finish™ FibaTape is also good for the repairs because it is quite strong and is also the thinnest product, making less of a bump for an easier to conceal repair.
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