I have not used that brand yet.
I recently used a fusible tape that doesn't need ironing. It is Wet N gone (by Floriani).
I simply cut about 6" strips and go across the seam in about 4 places. It's easy since you can place the tape on the bottom seam edge (facing up) of one piece and then butt the second piece together. You can add pieces on the top join if needed.
The tape helps hold the batting together and while doing a quick stitch with a wide zig zag. Plus the tape layer on the bottom helps the batting slide through the feed dogs. The tape is water soluble so washes out later.