if I created a wallet with a password and then exported the private key .Does in any way I will need the password or is the private key sufficient ?
Thanks
when you export your private keys you need to create another passedword to the particular wallet you are exporting it to so that you have easy access of opening the wallet and even the private key is not suppose to leave or forget
OP no longer needs a password to log in wallet because he already saved the Private Key to open the wallet, it has been explained on page 1 above by the community and OP seems to understand very well what the question is. Even logging in with the private key is sufficient and doesn't require any password open it in order to transact. Other problem is that he must carefully look at the myetherwallet address because there are a lot of phishing.