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You may not get hydorcal exactly, but there are several similar products on the market for various purposes (floor leveler, plaster patching, drywall repair, etc.) YOu can buy these products in larger quantities and for MUCH less $$$. Just ask a knowledgable associate for a plaster that doesn't set too quick and that is lightweight.
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Go to your local do it yourself retailer (Lowe's, Home Depot, etc.) and see what they have. This is true, the WS products are very good, but if you have a layout of any size you can go broke using them. When that happens to me, I just take a hammer and break it up for talus.
#20 MINUTE CASTING PLASTER FULL#
Just remember when you're using it, it cures about twice as fast as plaster, so don't mix up huge amounts at once, otherwise you'll have a bowl full of set hydrocal in about fifteen minutes. I usually use a combination of plaster cloth for the base scenery, and hydrocal for any castings I need to do. It has a much faster setting time than plaster, so you have to work quickly if you're planning on doing any moulding. Hydrocal's main selling point is that it's more lightweight than plaster, and unless you're using plaster cloth (like Woodland Scenics makes), a lot tougher.
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It comes in containers that look like paper milk cartons. If your LHS' in San Diego carry the Woodland Scenics line of materials, they should carry the lightweight Hydrocal.
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