ONLY along the very back and forwards approx 1 1/2'. (swim platform depth) I doubt any other boat brand would be able to glass that area either. It's simply unaccessable.
But yes, shame on Fountain for not sealing that joint fully. Basically, if it's not 100% sealed, (from either inside or out) it ain't sealed. And both mine weren't sealed 100%. Just slows the water leaks down. Good thing is, it's an easy $5 cure......by us owners.