Flexacryl and Flashband? Or just one?

[JJF1970]

Hi ... any thoughts on whether using Flexacryl AND Flashband for this gutter repair might make it less robust? Getting access is a real pain, so I'm thinking of adopting an overkill approach in the hope of getting a couple more years life out of whatever form the finished repair takes. The first coat of Flexacryl was mainly intended to start levelling up the surface to make a Flashband more effective (FB running along the gutter) ... but now I'm not sure whether to just stick with Flexacryl and apply more coats, or apply Flashbands, and then maybe Flexacryl over the top of that again? All guidance warmly received...