Pre 1970's boards were glassed with anything from 8oz to 20oz cloth including mat and other miscellaneous fiber material. Volan was the prevailing composition with silene to follow. Isopthalic resin was the primary resin of choice until orthopthalic was introduced. Epoxy and other resins were also used during that period. This can be accomplished if records identifying the foam manufacturer and stock from scraped boards are available.
Records are rare regarding the type of wood used in boards.
We all know what balsa looks like but to differentiate between plantation, virgin or Ecuadorian takes a little more research. Every effort is made to determine the type of wood and to use material as close in appearance and age as possible. With this in mind, special attention is made to ensure that original beads, if clear enough, are retained. If needed, beads and fillets are clarified or replaced as needed. Bootleg laminates which differ from the original have been glassed on boards in an attempt to increase their value.