When I glue boats, Its turned upside down. Squared, leveled and then pour the epoxy into the gaps. You can choose to grease or not. I don't grease and have been able to get boats apart with some heat from a propane torch and a dead blow hammer. I think for old boats this makes them tighter. I also use a file or sanpaper to clean up the casting and pylon to give the epoxy something to stick to. The last one I did I put a very thin coat on the pylon and casting before assembly to be sure the epoxy was everywhere. The boat ended up very tight.