Hi Andy,
I 100% agree with what Martin sayes, however!!! I had a little argument with a chain, which took a horrendous gash out of the corner of my boat. I spent a bit of time watching YouTube videos and LOTS more time getting a colour match. Practiced on an old dinghy I have and have done an end result that the boat builder really struggled to find the mend. It’s not rocket science and I found it really satisfying, but I do have the time.
The finished picture is before final wet and dry and polish, which did make a big difference.
Good luck!!