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Hi Ondrej,
Like Matt I have not seen this issue before but it certainly looks like defective material, it seems that some of the spools on the weft creel (each of the fibres that run down the length of the roll are fed from an individual spool) are of a different type of fibre, the more reflective material (most of the cloth) appears to look more like genuine carbon, and the darker section in lines looks like Diolen. Obviously it's difficult to tell from a photo but I cannot imagine it being caused by anything other than defective material, you will have to talk to your supplier about that, I know that this effect has never been seen on Diolen supplied by us.
The Reason that the problem becomes more obvious as you build the layers of clear-coat is the refraction from the fibres get more dramatic, i can't see how the resin could be having that discoloration effect.
I hope you get it sorted.
Paul Statham Easy Composites / Carbon Mods - Technical
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