Tony,
I don't know if Howfill is even available any more. WE have used Fiberite to fill 0.060 thick copper core w/o any problems. 0.040 thick copper core regularly.
Arlon has a prepreg that replaces Howfill, but I am not sure it will work for 0.060 thick core.
Rush
Accurate Engg Inc
www.accueng.com
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