Spraying Polysterene?

[Oni]

I\'m having trouble spraying polysterene(It\'s those white crumbly thingies you get with all sorts of stuff for those who didn\'t know) as it tends to be \"eaten\" by the spraypaint. Does anyone know how to prevent this?

 

[Brokenblade]

welcome to the boards , i think a good prevention of this is to cover the polystyrene with a thin coat of pva first before spraying as this stops the spray making actuall contact with the polystyrene, there are also certain spraypaints which do not contain the solvents that eat away at the polystyrene, not sure if they have a special name though, maybe someone else can fill u in with that info.

 

[slidedog]

Welcome and Brokenblade is dead on. Any of the expanded plastic/foam type products tend to disolve when the carrier for the primer comes in contact with it. Thin PVA or a water based latex over it before the primer will save the day.

 

[Astonia]

Welcome onboard Oni! And yes, the previous two posters are absolutely correct

 

[Legacy Account]

Just spray, and watch your handiwork disappear in front of your eyes! Just like a kid in my CDT class did with his GCSE coursework!

My, how we laughed. He had been warned too. He was never the brightest crayon in the box though......

 

[Brokenblade]

Surely everyone at some time has found a piece of polystyrene to spray *especially* to melt it......no, just me

well i did when i found out thats what happens to polystyrene, meh.

 

[E-Arkham]

You could try Model Master or Testor\'s (same company, just different lines). I\'ve never had a problem with them melting styrofoam. Try it on a small piece to be sure, however -- you never know when they might change the formula.

Main downside? Expensive. Like $4ish for a 3oz can. And also hard to come by in Europe, as I understand it.

Kep

 

[Mosch]

I never understood why someone would want to cover the foam with PVA. Wouldn`t it be a lot quicker (and cheaper) to just brush on a cheap-ass latex paint? I can get half a litre for an Euro in a nearby store and I have always used this stuff on my foam.

 

[Oni]

Aye, thanks for the information.
I once used some sorts of thin white paint, worked pretty well, but not that well. -_-

 

[freakinacage]

if you want a slightly rough texture, textured masonry paint is great, it undercoats, textures and protects(if you want to spray any colour on after)