Plaster bandage, often sold in the UK under the name 'Mod-Roc', is a coarse woven bandage impregnated with plaster-When making up a section of groundwork that needs to be very irregular or lumpy, I normally use odd scraps of polystyrene as a foundation. (If you ever buy some of the larger electrical items such as TVs or computers, you'll find they are usually packed in enough thick polystyrene to provide you with a generous stash.) Carve your lumps roughly to shape, stick them in place, and then apply the bandage. Simply take a length from the roll, dip it in water, and then smooth it over your 'Jumps' to blend them into the baseboard. You can then seal it with a layer of Hydrocal to give yourself a good surface for colouring, attaching 'scatter' and so forth.
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