my head gasket is leaking altho it is not a terrible leak i still need to get it fixed i am having the engine rebuilt this summer so i am going to forgo an actual head gasket replacement for the moment. i would like your opinions on the following head gasket sealants, let em know if you have used them and how they worked or just what you have heard about them.

Thermagasket
http://www.rxauto.com/

Steel seal
http://steelseal.com/?gclid=CKzxm8WZmJ8CFREMDQod_22hGw

Thanks in advance for the advice