CAREFULLY & SLOWLY work a series of very sharp, thin putty knives under the flange all the way around. (You need about 4 @ 1.5" wide and a small mallet). Try to cut the caulk line before prising out on the frame. IF it is a metal frame against a glass hull
, you can start the above, and once a gap is started, you take a red hot THIN, SHARP 1.5" wide putty knife, (keep a propane
torch going), and push it in the caulk line VERY hard & quickly. Then pull it out IMMEDIATELY, so you melt the caulk line, but not the gel coat!!! A few seconds in the flame again, and push it it right next to the previous spot. As you go, you use other putty knives as wedges, to make the space get larger & larger. It may reach a point where you can gently pull it apart, but if it remains really stuck, melt the caulk line all the way around. (I use a sander to sharpen my putty knives)
Each port can be done in about 10 minutes this way! You can then use the red hot putty knife to remove old caulk, IF you can't just rub it off. DO NOT let the hot knife stay still against the gelcoat
, and it will not hurt it. Of coarse... Don't burn yourself!
Best of luck,