I used 4200 on several deck fittings in 2007 and removed them last year to paint the deck and rebed them. They never leaked and the stuff was firm but not hard. 4200 is not epoxy so you simply need to cut through the stuff to break the bond without damaging the fiberglass underneath.
Once all of the fasteners are removed, I'd use a heat gun on the frame to expand the frame and soften the bond. Then use a very thin metal putty knife to start at a corner, then insert additional plastic putty knives into the crack as you go around the frame. Use a rubber mallot to drive the thin metal putty knife into the caulk. Take your time and it will separate. Chuck S > On 11/07/2022 7:58 AM John Read via CnC-List <cnc-list@cnc-list.com> > wrote: > > > > After 40 years, it is time to rebuild my forward main hatch. Issue is it > is bedded to hull with 3M 4200. Any suggestions on how to break that seal? > > > John Read > > Legacy III > > 1982 C&C 34 > > Noank, CT > >
