[quote=nacraflyer]I've sanded down two of the 5.2's and one 5.8 and all had the black undercoat you mention. All also had the chalky gel that would wash off when hit with a power washer. It is just from being left to the weather. I believe the black is a UV barrier. If I recall, I've also read something that it was a special coating that would help to hide the glass cloth weave. So, I don't think you have anything strange there. I would avoid sanding down to the glass if possible. Just take enough off to get to something that is not easily coming off the hull. I have found that there are huge numbers of air voids (large and pin size) under the gel that are a royal pain in the A** to get filled. The larger are easy to find, but the pin size won't show until you put a primer or gel on. Just try getting thick gel into a small hole, it won't happen and as soon as you sand that hole shows back up. I spent hours with diluted gel and a very very small brush building up pin holes. Lesson learned quickly, don't take too much off if possible!!
I'm no expert on the Interlux products, but when trying to decide to shoot with gel or paint all my research suggested not going with any of the paints. Unless it is bottom paint, none indicated that they could handle continuous water contact for more than a day or two without possible failure. That included sitting in wet cradles. If you are going to shoot, why not shoot gel? It was really no big deal and you can get a gun for $100. It's nothing special, just needs a larger 2.5 or so nozzle to handle the thicker material. You will end up with some orange peel since the material is thicker than paint when sprayed, but you won't need to sand unless you want the flat smooth finish glassy look. Mine looked great after the shoot, but I wanted the smooth finish, so I sanded. If you are going to sand the orange peel out, then put extra gel on![/quote]
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