No great solutions for you...

I suspect you imbeded grit and opaque debris in the layer. I have read many times on the board that it is far better to use a scraper between coats when the glass may be exposed for this very reason.

I wish Rob Macks would give you advice about removal of the offensive patch, or pressing on... If you cover it, it will always be there. One solution may be to paint the hull instead of leaving it clear. Removal of the layer of glass is possible, but will involve acetone, work and a fair amount of swearing. You may yet end up with a painted hull even after all the work.

If you do decide to use acetone, make sure the gloves you use are impervious to acetone (i.e. not latex). Using acetone on fiberglass can make it more likely that you will become sensitive to the epoxy resin... the acetone with epoxy contamination can drive the chemical into the dermis where it is exposed to the immune system -IF you do not completely keep the acetone and epoxy off your skin.

Next time, stay away from the sanding until you get some epoxy between you and the glass.

Sorry I dont have anything more encouraging.

Rick

: I noticed small white scratches on the surface of my Guillemont while I was
: applying the second coat. I had sanded the runs and fiberglass strings out
: of the surface before applying the second coat, and I was wondering what
: caused this, and how it could be fixed. I suspect I sanded too far into
: the cloth. How can I cure this without going to the trouble and work of
: sanding the cloth off and re applying, it is a rather large area of the
: hull. Also, when finishing, what is the best way to finish eleminate the
: textured surface of the fiberglass cloth? Repeated coats of epoxy while
: sanding between coats?