i've used laminated fabrics for picnic table clothes, tote bags- and kids placemat/table sets.
the creases disappeared - the table cloth one was folded (bought it online, came folded in a box)
i made the table cloth- and put it on the table in a short time the creases had flattened- and it is fine. i fold it when i put it away- when i get it out i smooth it and shortly it is flat.
i've not had any crease problems for any projects...but the creases were not (pressed in) only lightly folded.