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I got a peice of Styrofoam used to protect a Monitor, that would make a perfect bunker, with a little bit of work.  Only problem is that it's huge.  18x18".  So painting it is gonna take some time.  I've heard somewhere that spray paint tends to make styrofoam dissolve.  Is there any truth to that?

Also, I have a number of holes that need to be filled with it.  Some are a few inches deep, and many 8x3 inches wide.  What would you suggest using?  Modelling clay?  Thanks.

Yes, it'll melt away like a paycheck at Mardi Gras. It's the aerosol chemicals.

As for hole-filling... I dunno.

if you cover it with a textured under coat of PVA glue and sand you should be able to spray it but test on a small piece first. The first GW wargames terrain book used this technique and it looked pretty cool. Or you could airbrush( i gotta get one myself!) on normal paints. Hope this helps.

use water-based spray paint.
i do a coat of that then normal spray.
for the holes,use cardboard to roof it then a little bit of mesh for vents or something of the sort

You can also use thick sheets of plastic with greeblies glued on (like radomes, exhaust vents, hatches and what not). Just remember that superglue and plastic cement will also burn through styrofoam like a hot knife through butter, so you'll need to either use white glue or some sort of paintable epoxy glue. The latter being preferable if you want it to take being handled.

Common spackle also serves as a nice cover. I will typically glop it on and then sand it down with a dremel or such-can prep a piece about the size of a defiler in about five - ten minutes after the spackle has hardened.