On Jun 13, 8:19*pm, wrote:
I do not know what you try to do, but base on my experience the gaps
supposed to hallow/empty. What is my experience ? I built 38ft
sailboat Spray.
I use corecell as a sandwich construction. The idea was to keep
sandwich as light as possible. After corecell was installed I used
very light putty – to fill gaps only on the top.
Next was sanding and on the top fibreglass with resin.
In short – do not fill the gaps with resin.
I hope it helps.
Mada

I was referring to an article:
http://www.boatbuilding.net/article..../01/24/1330205

It said to put scored balse core material on top of a 10" PVC tube to
open the cuts and then apply epoxy mixture into the cuts.

Now, I re-read the article, and I find that he used 3/4" core, and I
am using 3/8" core. This means his is double the thickness of mine.
I think this explains why his core can open up using a 10" PVC tube,
and mine cannot. I probably needs to put the 3/8" core in a smaller
diameter pipe than 10" if I want to apply epoxy inside the cuts (may
be 6" pipe).

Having said this, seem like you don't need to apply epoxy into the
cuts and your boat is doing just fine. I guess applying epoxy into
the cuts may be a "belt and suspender" kind of thing. Thanks for
pointing out a different approach.

Jay Chan