Did a skim coat of the hull. Skim coat of the deck went fine. After finishing the hull I noticed some light spots that does not seem to absorb the epoxy. I had sanded to 120# and initially used a tach cloth, but read that was wrong, so used Acetone to clean the hull.
Since it’s just a skim coat, I can sand the affected area then re-apply the epoxy, but want to make certain it’s a surface defect. All I can think of his glue squeeze out, but I did not see anything like that when sanding. One of the defects is in the middle of strip which would lead me away from the glue idea.
Thoughts?
Lou
I had something like this happen and it was packing tape and packing tape residue. I glassed over it before I noticed so I ended up cutting out some fiberglass to fix it. If you get it to bare wood it shouldn’t be an issue.
Its wood glue squeeze out and a hidden benefit of a skim coat (allowing you to see it)
Sand it out and confirm all off with another skim coat. With strip builds, the strips can be sanded without woŕying about sanding through a veneer…you should have space.
I would use 80 to 100 grit to get it off and then come over it with whatever finishing grit you used for rest of surface.
Sometimes with the right lighting you can notice it before the skim coat…but the skim coat reveals all…
H
As Howard says, it looks like thin pva glue. Wetting the wood with plan old tap water also works to show up the glue, showing a white patch and cheaper and quicker than a skim coat 
Ditto to peter…water works too…just don’t go crazy with it
Thanks for the good suggestions! Going at it initially with 80# really helped.
I’m in the middle of fiberglassing. Just need to do fill coat in a couple of hours. Planning to do what Nick did with the Petral play where he did a light fill with the first layer, then put on another layer when hull and deck are joined to go between the chines and over the external stems.
in Nick’s book he suggest leaving the hull curing for multiple days before popping it off the forms. In his petal play video (possibly because it’s a light fill) he just did it overnight. If possible, I’d like to pop it off tomorrow so I can do the deck before it starts getting cold again. I can then work on the combing while it’s cold outside.
Is it possible to pop the hull of that fast or am I asking for trouble?
Lou
