There’s not much to it. You glue on what ever your
using and pull. If it comes off and it didn’t move
far enough you glue it back on and pull on it again.
Too far? Knock it back in. The black marker shows
the highs and lows. Just like using a guide coat when
doing bodywork. That what will get you to a flat
surface.
Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.