After my usual 3 -4 hours fibre-glassing, I thought I would try to tidy up the filler cap, the gold painted lid was pitted and the outer ring with the machined grooves was corroded/stained. Twenty minutes with a wire brush on the outer ring and it looked worse than before I started, so, I decided to get rid of the grooves. Half an hour with a file and they were gone but there was some collateral damage on the lid so that got treated to 240 wet and dry.
Here are the before and after pictures, I am leaning towards not painting the lid but rather treating it to progressively finer wet and dry and 10 minutes on the buffer.
fallout frank horrigan
fallout ian