Removing caulk/ port side hatch cover- 342

i am trying to remove the cover on the port side to access the door tracks for repair/cleaning. I have the screws out but the caulk is like a permenant weld to this panel. Is there a trick to getting this panel off aside from heavy prying? I'm afraid the fiberglass will break.
2003 Rinker 342 Fiesta Vee, 350 Mag MPI, Bravo 3 2.20:1 w/ 22p 4 x4 props
Comments
Boat Name: King Kong
"Boat + Water = Fun"
You will have to buy a couple cans of Anti-Bond which removes polyurethane adhesives...5200 is a polyurethane adhesive. Here is a link.
http://www.westmarine.com/buy/anti-bond--anti-bond-2015--P001174804
That's a good point. Will anti-bond pentrate the filling, or do you remove some 5200 and then re-apply the anti-bond?
Boat Name: King Kong
"Boat + Water = Fun"
I ended up shimming the bottom track up and adding washers between the door and train's on the upper track.. The door FINALLY slides easily! So glad to have that black grease out of the track and it working with one hand. The PO had put a graphite grease in the door tracks which ended up everywhere and was so dirty / dried up.