I am completely going through my Bravo ODs and transom assemblies. Bellows look to be in good shape. However former owner's mechanic seems to have applied silicon blue sealant to the male OD part that compresses against the round part of the bellows. I my opinion, he should have sanded and repainted OD. Old paint on OD lifted and may have caused seal to leak. A quick fix may have been to add silicon, which he did. I have since sanded, primed and painted OD and also cleaned off crud and old silicon sealant from bellows. Is there a special (large) o ring to add that will aid in future sealing? All the indents to bellows caused by crud have raised. Attached is photos:
