I believe the spray you used is not water soluble, therefore you have to remove it with alcohol. Please refer to the directions on the can.
I prefer to use the 505 spray which is water soluble.
I can't help with using fusible batting as described. I just know about using the 505 with great success. i am quilting a christmas quilt with it now and i just can't say how much I love the product and how much time it saves me. the backing comes out perfectly if you set up your quilt correctly.
I would definitely recommend clipping to a table with clips rather than using tape or the floor.
You can purchase the large black binder clips at any office supply store such as Staples, Office Max, etc.
Lisa