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Subject: Do I need to prime foam rss

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Lawrence Spode
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I have read that you are not supposed to spray paint. This was the result of a test with the textured spray paint.



Would be good for a cavern board but not what I am going for.

So if I go the sand and brush route, Do I need to still spray prime?

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Hugh G. Rection
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Some types of spray have something in them that will have a dissolving effect on Styrofoam. There is a specific type you need to look for that is safe for foam. Check this thread I found via Google.

I need Styrofoam friendly spray paint
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Andrew Walters
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You shouldn't use spray paint on foam. First, there are dangerous vapors. Gamers have been sickened this way. Second, even if it doesn't melt the foam outright it damages the foam, reducing its density, making a mess of things.

When you're done cutting and assembling the foam and before you do whatever is next, get yourself a dollar store paint bush and some 50-50 mixed white glue and water. Paint over the whole foam thing, thick and sloppy, fill all the crevices. Now you're set, you can spray paint it, brush paint it, texture, whatever.

Easy, safe. Cheap. You only need stuff you already have around. Only hassle is that it's an extra drying step, but it doesn't take long.

Sometimes I paint it with full strength white glue and then throw sand all over it to coat and texture in one go.

Andrew
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Jake Staines
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Subhuman wrote:

textured spray paint
...
sand and brush route


If you're after a textured result, have you considered masonry paint? It's pretty cheap, amazingly durable, and if you're not happy with the texture of the paint on its own, it holds things like sand pretty well in my experience... and because it's thick, it seals the surface of the foam pretty well preventing future solvent use causing a problem.

I covered some styrofoam terrain boards for wargaming a little while ago with masonry paint, and it sealed it enough to wash it with white-spirit-thinned oil paints and not have a problem. As a bonus, the paint is so hard-wearing that hills that are covered by it almost feel like they're cast in plastic.
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kSwingrÜber
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I've been wondering if the spray-paint specially formulated for plastic would work on foam... anyone tried it?

I happen to have some "plastic" spray paint (red I think, left over from a halloween costume project a couple years back)... if I think of it I'll experiment (outside of course!)

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MURRUMBEENA
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Diluted wood-glue works best, just as Andrew described.

I have also used acrylic house paint as a primer (it was left-over). The paint needed two layers but created a very tough "skin" on the polystyrene. It was possible to write on the surface with a 2B pencil.
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