Some times it pays to be a red neck
If you have an inspection cover this worked well for me. I used a metal rod running under the deck (hooked to come along) to spread the load.
Before figuring this out, I cut the seam of 5200 best I could and the thing would not budge no matter what I tried. Hooked this contraption up and even though it didn't move at first, I put it under as much load w/o doing damage as I could and moved to something else. Couple minutes later it had pulled loose. Put a wedge under the panel, cranked the come along a couple more clicks and did same. Couple min's later it moved again. The sealant has enough elasticity to it it stretch's before giving way.
Use a similar jig previously to pull the fuel tank.
Love my $19.99 Walmart come along almost as much as my hammer.
Did this to replace an eratic sending unit and check a p/u for the port engine which seems to have a starvation issue and ended up learning some things along the way.
W/the sending unit out I used a light to inspect the inside of the tank. Was seeing/remembering that the bottom 1/2 of the tank is the same angle as the bottom of the Vee while the top 1/2 is square. That would explain why the boat seems to run all day on the 1st 1/2 tank of gas and inhale the 2nd 1/2 Never even thought about it but the bottom 1/2 of the tank probably holds 1/3 the volume as the top 1/2 but the gauge doesn't know this.
2nd lesson was while pressure testing the p/u unit in a bucket of water. @ 10 psi it was impossible to keep the hose from leaking at the clamp w/a single clamp in place no matter how tight. Of course this fitting is not under pressure but everything past the pumps are and may effect the pump (cavitation) being able to pull fuel up out of the tank.
Coast Guard requires doubles on everything anyhow but...
This was on push lock style fittings.