gutter sealant

[birdshill123]

While washing the Bird today I noticed some black sealant in the front
gutter above the windshield. It was covered with the factory paint. The
sealant has shrunk over the years. I would like to remove the old stuff
and replace with something good. Someone already tried with silicone
(bad choice). I do have some Sikaflex black ,forget the product #, but
this stuff is used by most major RV and truck body builders. I do
remember it was damn expensive. Very glossy. Probably not paintable but
who can see the gutters anyway? Any other suggestionas for a good
product?

Bruce 1988 FC35