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So, I'm working on a somewhat larger papercraft project, (about 3 cubic feet in size) and by the time I am done, I don't want it to look like it's made of paper. At the moment it is assembled in sections and coated in a hardening resin, but I need a material to put on top of the resin that will let me fill in any cracks, do general re-contouring, and be paintable without looking like shit.
I've seen some people use auto body filler, but this would be way too pricey for me. Know any good alternatives? was wondering if some sort of clay would be a possible route, but it needs to be a material that can be fully smoothed out.