So I used Entropy Resin epoxy for this board when laminating it and hot-coating it. Is the
attached picture what is described as fish eyes in the hot coat? Might
be hard to see, but there are small low spots around the board which
don’t get sanded and remain shiny, thus looking like freckles all over
the board.
I
had this happen on an HWS when I glassed it, but accepted it and sanded
it best I could and moved on. any tips on how to avoid this in the
future (I think hang around and watch for them, and drip in new epoxy to
fill?). any tips on how to clean them up or remove the shine from them
at least? I’d rather not sand it all smooth (probably going close to the
cloth) and then use more resin to re-hotcoat it, but maybe that’s the
only option?
A good option is a light sand and scotch bright the shiny fish eyes and re-hot coating. Making boards has its trials, and it will test your mettle, like a refiner’s fire, with gold.
Do a search on fisheyes and you should see a ton of info. The picture is small so just from what I’m seeing it looks like those were just random low spots, maybe not true fisheyes. You will know fisheyes are the real deal when you can’t get the resin to flow and fill the spot.
If they aren’t too bad you can drip a bit of resin into the spot as it thickens and it will fill the area. Other times depending on the contaminant there is no way it will fill.
Because it is contamination sometime just sanding the spot after will only spread it around more. So sand then wipe with DNA and put just enough resin to cover the spot, then re-sand.
The whole fisheye thing is like solving a murder. You really got to think about every little detail on what your doing. Most of the time a bad fisheye is caused by some kind of silicone or oil. So clean hands, clean tools, clean rags, dust control, source of oil like compressors, even one poster said his anti-perspirant was falling from his armpits onto the board causing bad fisheyes. It can be something simple or drive you nuts.
