How to remove Pellon P888 from a T-shirt quilt?

My first T-shirt quilt. Was given wrong information on what to use to avoid T-shirt stretching. Before I continue, need a safe fix so it won't ruin my quilt. Also what batting do I need? Anyone know where to find material large enough to cover the back side of a queen quilt? Help
q how to remove pellon p888 from a t shirt quilt
This is the back side with the Pellon P888.
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