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Start of by cutting shapes out of various sizes of balsa wood. And stack them up gluing them into your desired size/shape.
Then cover the whole thing with Quick Drying Polyfilla. I thought this was a good idea :-
estarriol wrote:one tip if mixing powder polyfilla/tetrion etc. get a tub of watercolour paint powder or cheap acrylic in your base rock colour (so grey, light brown whatever) and mix that...
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