I need some help for working with foam (modelling foam similar to polystyrene) Im making a Servbot mask and for the silver bit on top of the helmet i've decided to use foam to sculpt it from as its easy to shape and sand down. However i dont know how to (1) coat the foam in some way that gives a smooth, untextured surface, i want the surface to be completely smooth and not see the texture of the foam (would just sanding it all down work?) and (2) How to paint the foam. I know you cant spray paint foam as they tend to melt it
This is the block of foam i have to sculpt from:
http://www.fileden.com/files/2011/10/6/3205467/P1050187c.jpg Mainly im unsure how to make the surface of the foam smooth to not see the marks, holes etc that foam has. Paint i could try trial and error i suppose but wondering what most people here use when working with foam builds? I've never worked with foam before