It's going to be a pretty horrible job, but within reach of most DIY'ers. Take your time to build up the layers and it will provide a strong
water proof edge needing less
maintenance
Spent half an hour talking to a friend in the
boat yard a while back, whilst leaning on his transom.
He explained he took the swim platform off his large formula
power boat. Filled the holes, cleaned it all up and asked what I thought about it. I said you wouldn't have known, the
gelcoat looks mint. The said it was
paint, so despite leaning against it for half an hour, I hadn't realised he had painted the transom and blended it in very well to match the remaining topsides.
Pete