With the Pellon 987F it's pretty important that you follow the usage instructions exactly. Here's the instructions, directly off the packaging, for those who may not have gotten the manufacturers instructions where they bought the product:
Step 1: Cut fusible Fleece to the desired size.
Step 2: Place Fleece, fusible side up, on ironing board. Place fabric, right side up.on top of fleece.
Step 3: Fuse
For a Light Bond -- With iron at Wool/Steam setting, iron fabric in place. For most applications, this should hold the fleece for easy handling while the project is stitched and/or glued.
For an Extra-Strong Bond -- Cover fleece and fabric with a damp press cloth. With the iron at Woo/steam setting, press for 10-15 seconds. Repeat, overlapping iron until entire area is fused. For additional loft, use more than one layer of fleece.
Hope this helps...