thanks Mapism, Jfm for the info,I will try again, Rafiki the first two pictires are after I drimeled them out over 52 of them, the third and forth are the completed repair, still in my garage the light is not that good, I was going to use them as an example, the swim platform had three different shades, when I eventually finished rubbing down the whiter colour showed, if you expand and look carfully you will see. I practiced on the swim platform before I started on the boat as I didn't want to mess up.
Tony