Thanks for mentioning fusionFiber.
175 lbs of Structolite has about the same coverage as 2-3 lbs of Fusionfiber, plus you will not have to worry about texture or glue purchases for your basic cover. Also you can apply static grass directly to the wet base. Will not chip and very light weight when dry (less then 1oz/sq ft). Build a scene on bench and simply blend it into layout.
the working time is measured in days. Also once completely dry it can be misted with wet water to reactivate the glue and soften material for shaping.
Here is a thread
thanks
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Bill D