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surface prep and gap size matter most in a good bond
5200 is a flexie sealer not a strong glue bond more of a caulk/filler
I would sell the older flat bottom and get a V or cat
but if you must glue bits on a bow
1 grind to bare glass ruff thru the gel coat
2 do the same to the new bit
3 clean the bond area with acetone
and use a good quality bonding polyester with mini -MEK [hardener]
and use heat to aid cureing
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