Stephen,If my memory serves me correctly,all the early KRs in SA were built
using polystyrene foam.About 30 years ago an article appeared in Wings Mag.(SA)
describing the KR as "the amazing little plane built from cooler boxes and
piano hinges"It was in all a very inspiring article.I think polystyrene
preceeded these modern day foams of today.This foam was easily obtainable,even
from the refrigeration industry.I used 24 density polystyrene foam.Epoxy resin
must be used.Polyester and most glues and solvents will melt it.
Regards to all ,
Eric Evezard (S.Africa)
