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How well does foamboard take paint/spray....i dont want to texture it first...just put the paint on straight away.
My friend can get hard plastic and laser cut it for buildings but this material scratches too easily

Styrofoam? It melts if you use spray paint - so I would say brush paint with water based paints first.

Do you mean the stuff that is foam between two layers of card? If so, not great. I've seen the card delaminate from the foam after being sprayed. If you do want to spray it, I'd take some cheap craft paint and paint everywhere the foam part is exposed before spraying.

Or use watered down PVA glue on the foam.
Also don't spray too close - if the paint is too wet when it hits the foam board it can cause warping.