The bond in that seams, IMHO, is at most 20%. One should not see any bubbles or "white" areas in the seam.
Looks like there is a solvent weld at the perimeter of the seam and will be difficult if not impossible to get the WO to wick through the entire thickness of the panel.
You will most likely have to cut it apart and get clean edges to do a proper solvent weld.
JM2C
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