Got to repairing the bottom of my nacra 450 hulls. There were a couple places where the gelcoat had worn off (see earlier thread). Anyway, got some marine epoxy from TAP. Decided to get it from them, cuz they had the most useful information on the web. Also got some silca, sort of like cabosil, but not as good or expensive. They call it Visco-Fill II. Since it's on the bottom of my hull, I don't plan on painting for UV protection.
I started without any filler on a nice sunny 70 day. Used their 'fast' hardener. I want to put it on thicker than a coat of paint, so next batch/coat I'll add more filler. Took about 40cc is all for the first coat.
After the first coat, I noticed what looked like a hairline crack. Lots of scratches had disguised it. I squeezed both sides of the hull with my hand and some darker liquid oozed out (see arrow in pic). A very small amount, maybe a drop. It went back inside when I released pressure.
My guess/hope is this ain't real serious. Starting from halfway up the vertical surface of the bow, making a 90 along the bottom for about 2 ft, there's about 1/2 that length that has a stop-and-start crack like the one in the pic. I was able to get a couple other blebs to appear like the one I described.
My plan is to continue with another coat of epoxy. I'll make it extra thick in those areas. The other option that comes to mind would be to grind off the surrounding gelcoat and make a glass patch. Never worked with fiberglas, though.
