My friend has a hole about the size of a dime in the upper corner where the bobstay is at. It's been there since he bought the boat (6 years ago) and the previous owners said that it had been there since they first purchased it. It doesn't seem to be causing any problems and somehow there's like zero moisture in it. But how should it be fixed? Can 3M's 5200 sealant do the job? Or would you suggest marine tex or a fiberglassepoxy?
Beware and be careful of its use. My feeling is that the only place it belongs on a boat is the hull to deck joint. Years ago someone mentioned another "acceptable" use, but I'm sorry, I forgot what it was.
Holes in a boat can use butyl tape by Maine Sail. Good stuff. Best under compression, but I use it for chainplates, too.
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Marine Tex is fine for filling small holes, like old screw holes. West System epoxy with some thickening additive is even better. I found that even the white marine tex will yellow from UV, so you need some paint over it.
Ideally some bevelling along the hole edges helps the strength of the repair. When filling screw or drill holes, I simply use a countersink bit to bevel the edges of the hole.
Bevel the edge and fill with thickened epoxy if you must fill it. to do it right, you'd need to sand the patch smooth/flush which will make a more obvious spot than than the current hole. Epoxy is not UV resistance so will yellow and the surface break down unless you paint over it.
Sounds like it's not hurting anything so filling is strictly cosmetic. Of course, be sure it's not there for a purpose before filling it.