This had to be one of the most time consuming bits for me.
The inside edge is rough and I didn't realise it had to be ground back and filled with black gel coat filler. This took a while to figure out, then fill, file back, refill, file back, re..... you get the picture. The problem I had was getting the radius to follow the top edge. I eventually cut out a shape out of a plastic Evostick spreader and as I filled the gel coal I used it to form a continuous round edge.
I didn't get any pics as I was too focused on getting the bloody thing correct.
One tip for anyone, don't tackle this first like I did, do some smaller things with gel coat to get used to it. Mixing a large amount of gel I found near impossible not to get air bubbles trapped, which lead to pin holes as you sand and polish! :(
EDIT: (2012) A good tip someone on the club just mentioned was to get the correct combination of hardener - gel before attempting any repairs! e.g 1 teaspoon of gel, tested with 3, 4, 5 or 6 drops to find the correct mixture, allowing to set over night each time.
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