Transom extension on a 74' 20' seacraft

[warthog5]

That's not the way to repiar fiberglass.

It's fine to glue the piece's in place to hold them in position, but now you need to grind all the seam's back in at least a 12 to 1 ratio.

That means if the panel is 1in thick you grind it back 12in, with the center at the seam ground back to almost zero thickness.
A 1/4in thick laminate would get ground back 3in.

Light weight fiberglass tape is not gonn'a get it. You want multi layer's of +45/-45 biaxal with the strand's running across the joint.