Gunwale rubber fitting
 

I had to remove the gunwale rubber and now need to refit it.
Originally it was held on using resin glue, the join from the hull &
top section on this fibreglass boat protrudes out 20 mm (like a tag)
and the rubber section pushed over this and was held with the glue. I
removed the old resin glue back to the original fibreglass.
My question is how do I hold the rubber firmly in place with no gaps
between the rubber edge and the hull while the glue goes off.

Thanks in advance.
Bruce