hello omak,
from what i've read here on this thread, yes, the bubble jet works way better than the sheets that are ready to be printed on. i know what you mean about that second liquid: it's a rinse that bonds the ink to the fabric that final time.
someone here asked if she could use those pretreated ready-to-go sheets along with the bubble jet because she was dissatisfied with the pretreated sheets, and i said i don't think so, because the chemicals may not be compatible. i would not risk it. you would lose the bubble jet and the fabric and the rinse and the time.