I wanted to know that is it safe to make payments oveseas and whats the gurantee that the person will send me the product for wich i have sent money for ,
That depends on MANY factors all listed in Paypals buyer protection policy for you to read so you can risk assess your transactions. Legal (bottom right of Paypals pages) > user agreement > buyer protection.
But remember if you are buying items internationally then if they are misdescribed (or Chinese tat) then the cost to return them for a refund is often more than the item is worth.
Advice is voluntary. Kudos / Solution appreciated.
