Can you use polyester resin for casting?

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Polyester Resin - Cure Time and Casting Simplified
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• The polyester resin is a polymer which is used in
  protecting the wood against the adverse effect of
  water. Water spoils the wood and the cost gets
  worst, and to saver the wooden materials this
  resin is the best and supportive item. The wood
  with the resin in which polyester resin is used
  protects the ply and wood from spoiling.
• The polyester resin does not enter in the wood
  grains for gaining a proper grip when treated.
  The resin cannot enter in the wood grains when it
  gets wet, and it even cannot enter in the grains
  of the wood when it is painted. The treated
  plywood is not fine as polyester resins cannot
  enter in the wood grains for gaining a proper and
  fine grip. Delaminating occurs when the
  fiberglass resin is applied to any plywood.

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• One can use the plywood which is untreated and
  can coat it with the polyester resin for the fine
  effects. The 28 polyester resin is not usually
  the best and fine choice for the purpose of
  waterproofing the plywood or marine it or for
  others. The alternate of polyester resins - epoxy
  is a better and the supportive a lot for the
  purpose of water restraining etc saving of wood
  and ply. This is bit expensive in comparison to
  the polyester resins.
• The polyester resin should always be used when
  there is water presence. Epoxy is costlier than
  resin but for the sake of wood and ply to make it
  away from water effects the polyester resin is
  the best and enough supportive. In the north east
  states where rainfall is frequent, the use of
  this type of resin is abundantly used. The resin
  mainly protects the wood from decaying. Water is
  harmful for the ply and wood, and now days
  water proof plywood and wood especially for the
  door purpose in houses are available. These woods
  are coated with polyester resin for FRP to save
  the wood from decaying.

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• The polyester resin is in graded with the glue
  which bonds the layers of the wood and making it
  water resistant. To save the wooden materials the
  polyester resins are one of best and supportive
  item. The resin should always be used when there
  is water presence. On halogenated and unsaturated
  halogenated polyester resin composites for the
  open laying up containing and moulding the
  styrene as the key agent for the purpose of cross
  linking reaction. Polyester might include other
  kind of moieties which are derived from the
  unsaturated monomers ex- dicyclopentadiene. The
  polyester resin does not enter in the wood grains
  for gaining a proper grip when treated. A 28
  polyester which is used for commercial purpose is
  based on the phthalic anhydride, propylene
  glycol, maleic anhydride and ethylene glycol in
  the styrene. For the water resistant the 28
  polyester is mostly preferred, and to some extent
  the polyester resins are bit supportive for the
  above mention purposes.

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