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I am currently in the process of building a large coil. The secondary
form is 8" in diameter and 40 inches long. I sealed the outside of the
form with urathane twice, wound the coil, and then coated it 4 more
times. I want to seal the inside of the form, would drying it and
sealing up the ends with great suff foam work well, i was wondering if
the foam would actually have any dampness in it that it may seal into
the cardboard form.
Thanks for your help!