Hi you can buy a self adhesive tape from Builders Merchants and DIY stores, Look in the plastering dept or ask. It's made of nylon and comes in rolls a bit like the plasters scrim and then can be filled out and will prevent cracks re-appearing.
Regards
KB
What i normally do is use skrim tape (as above said) down the join and then mix a little dry line adhesive and push it in to the gap over the skrim getting in as much as possible so there are no gaps. Let it go off for about 20-30 minutes then get a wet brush and brush off any excess leaving you with a gapless joint with the added protection of the skrim tape
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