This is just a guess/theory:

I'm not sure how aero composites laid up there fuses?? It appears they may have used a resin rich face coat technique..

For a resin rich face coat they would first "paint" a thin layer of resin in the mold and let it tack or flash off..Then proceed with the rest of the laminate...Only problem is if you let the face coat flash off too much you loose the window for a chemical bond to take place...If that happens you must scuff sand prior to continuing or adhesion will suffer...It appears they might have exceeded that window??

I imagine they laid the fuse up in halves and joined them after they cured which would explain one good side and one which is peeling..

I'd imagine the fuse is fine from a structural standpoint...Just a cosmetic sort of problem..

Just a theory..



edit:
One thing you could do to help ensure you don't have a perpetual problem is a tape adhesion test...You would use some strong masking tape (ie: good quality 3M)...Adhere a strip of tape to the fuse and briskly pull it off (Only if you can do so without risking damage to the fuselage from buckling ect...If that is a concern remove it more gingerly or use a less aggressive tape such as scotch tape ect..)

Repeat this process until you have covered the whole fuse..

We do this process on full scale aircraft to test paint adhesion (spot testing of course.. )

Chuck