penski

I am wanting to do some allpique work on a quilt, someone told me about Invisafil thread how it is wonderful to use for this pupose because it just sinks into the fabric and almost dissapears in the fabric , this is what i am wanting, any one that uses it can you tell me if this is true and is it good thread to use for appliques, and do you put it in top and bobbin both when using it ?

Thank you