There is nothing wrong with using 1708 in-between but you should have mat on both
sides of the 1708. I know that putting glass in-between cores is a very good way to make a core even better. That is a fact. Te problem is that you were not set up to do the job in a timely manner. I prefer vinyl ester resin over epoxy because of viscosity also. Especially over west system epoxy. get everything layer out properly for speed of process. Rollers are a good choice as said in a post. . I use rollers all the time on wetting out glass. I like the thin diameter 6 inch ones at home depot..You have to stay wet also. Dry laminates are a problem. Then you should have a clamping system to squash everything tight. This should all be done dry more then once before the real wet lay up. Again the 1708 was a good idea to make your cores even stiffer. Look at how stiff the coosa is with the glass in the foam.
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