what's the diffirent between lightweight and heavyweight joint compound???

when i buy the joint compound,there are many kinds of joint compound,such as All Purpose Joint Compound \\ Lightweight All Purpose Joint Compound \\ heavyweight joint compound,who know their diffirents,thanks a lot.
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On 14-Jan-2008, snipped-for-privacy@gmail.com wrote:

go here
http://usg.com /
and put joint compound into their search box.
you will get all the info you could possibly want on the different types of joint compound.
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