Installing Floor In Aluminum Fishing Boat What Product Will Stop An Outside Wall From Leaking?

What product will stop an outside wall from leaking? - installing floor in aluminum fishing boat

private party patio concrete floor is level. When it rains, water seeps under the wall plate level. I have to install a seal on the walls. Also installed aluminum flashing. if the rest of the court is saturated by rain, the water still works the way is there something I can use to seal between flashing and the concrete?