Fabrication board suitable for high end front projection

Does anyone know of a board of some kind, maybe foam board or similar, that would be suitable to build simple structures from, and has a very good surface for projection without further treatment?

By ‘very good’ I mean something with a gain of probably 0.6 to 0.8 and a wide viewing angle

Failing that, does anyone know of a more affordable alternative to screen goo?

cheaper gonna be to use water-based paint
anyways anything matted is ok
i wanna try something like that http://www.rustoleum.com/product-catalog/consumer-brands/specialty/reflective-finish-spray/
about gains i’ve seen few screen gain paint’s too, but they were looking really shitty, as for material with gain reflective vinyl, but not sure if it works, needs testing first