Fibreglass boat transom repair - Lempäälä, Finland

Water had seeped in from under the bumper tapes to my boat during years of use. I noticed something odd, when motor thrust caused the rear of the boat yield a little. Just a quick repair i thought... how wrong i was :D
Watch and see. First ride of the season also included.
Shot with GoPro Hero4 Black
Music: “Tomie's Bubbles” (by Candlegravity) [freemusicarchi...]. CC-licence [creativecommons...]

[@GilesStratford79]

How long did it take start to finish to complete the repair?