Howzit,
As a beginning board-builder, I would like to practice the polystyrene lamination and resin tinting prior to using it on an actual board. However I cannot source any scrap PU foam. Is there any other readily-obtained cheap material I may use for this purpose? I have been thinking of anything flat and white, such as thin wood paneling, however to save time, I'll ask Swaylockians about this first.
Thanks for your consideration.