> > |The problem with this stuff is that the surface is rough and when the
> > |resin gets into the pores and rough parts of the foam plug, the inside
> > |of the part is rougher than hell. It is very hard to sand it smooth.


Solution,  smear the foam core with bondo, smoothing it out and then sanding
it smooth to the desired shape.

Bob Smiley
N94RJ