Crack in ceiling

[audi321]

So I've a 4 foot long crack in the ceiling probably where a plasterboard joins.

Is there realistically anything I can do? I need to paint it so does this thick paint for cracked ceilings actually work?

Thanks in advance for any help!

[Flintstone]

Under a 'busy' room upstairs room? If there's a lot of traffic across the floor above I think you'd be better off taping it properly otherwise you'll be filling it over and over again.

[x 7usc]

you need this

http://www.decoratingdirect.co.uk/viewprod/k/KIPCR...

paint over and if needed a very light skim of filler will do the job

[CO2000]

Use this tape below & some fine filler. Slightly gouge out the crack with a screwdriver, T off the ends of it & brush out with a damp paintbrush before taping & filling.

http://www.screwfix.com/p/no-nonsense-plasterboard...