Polystyrene cliffs?

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Monday
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Polystyrene cliffs?

Postby Monday » Tue Feb 16, 2021 10:31 pm

Looking to create near vertical cliffs where there is no room for a hillside. I rough cut 3 or 4 layers of 25mm polystyrene, topped it with some grass mat and the rough polystyrene looked good as a chalk cliff. But the surface will crumble if I leave it and won’t take paint very well. What can I best protect the surface with? Matt varnish, lacquer? I am a bit wary of polystyrene since years ago trying to glue layers with some sort of adhesive that dissolved the polystyrene entirely. I watched it just disappear!
Suggestions welcome

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GeraldH
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Re: Polystyrene cliffs?

Postby GeraldH » Wed Feb 17, 2021 10:06 am

It may not be quite what you were after, but I covered my polystyrene cliffs with polyfilla mixed with powder paint. There are some pictures towards the end of my layout thread.
Gerald H - BNR Correspondent :)

My layout: http://www.newrailwaymodellers.co.uk/Fo ... hp?t=28854

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Flashbang
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Re: Polystyrene cliffs?

Postby Flashbang » Wed Feb 17, 2021 10:57 am

Its usual to cover Polystyrene once carved to shape with Plaster Bandage, then when set it forms a seriously strong virtually crack free structure that is a fairly light weight covering, which can be painted and have scatters glued on etc
Plaster Bandage is sold by several retailers and perhaps the larger one is Hobbycraft in the UK, £1 per roll https://www.hobbycraft.co.uk/plaster-of-paris-bandage-10cm-x-3m/577665-1000. Cut bandage roll up into smaller manageable sized pieces, soak for a few seconds in water and apply in overlapping layers. Allow at least 24 hours to fully dry then paint etc
[Image << Click the Icon to go to my website
Broken? It was working correctly when I left it.

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GeraldH
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Re: Polystyrene cliffs?

Postby GeraldH » Wed Feb 17, 2021 9:34 pm

Flashbang wrote:Its usual to cover Polystyrene once carved to shape with Plaster Bandage


I'll second that it's a very useful and cheap scenic material. I have actually used this bandage under the polyfilla and powder paint mix on my extension. Some of my earlier cliffs have the polyfilla mix dabbed directly onto vertical card surfaces.
Gerald H - BNR Correspondent :)

My layout: http://www.newrailwaymodellers.co.uk/Fo ... hp?t=28854

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Phat Controller
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Re: Polystyrene cliffs?

Postby Phat Controller » Sat Feb 20, 2021 11:35 am

I have used polystyrene exclusively for walls, and cut escarpments, on my layouts and use water based acrylic poster paints to protect them.

I do, however, cut the styrene on a proper styrene cutter bench. The heat from cutting "seals" it to a degree and I apply the paint liberally over it. This seems to also "seal" it somewhat again, but will NEVER stop it from breaking!

DSC_0534.JPG


This is a sample of walling I have done with the cutter and acrylic paints

Hope it helps
research = asking a bloke who knows a bloke who said something vaguely similar to what I wanted to hear! - Tony (aka the Phat Controller)

Monday
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Re: Polystyrene cliffs?

Postby Monday » Sun Feb 21, 2021 10:21 pm

Thanks all. Looks like plaster bandage then. I have a Hobbycraft locally so I can click&collect without needing £20 worth of plaster bandage for free postage! :D

gppsoftware
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Re: Polystyrene cliffs?

Postby gppsoftware » Mon Mar 01, 2021 1:29 am

Personally, I wouldn't be using polystyrene as a means of supporting any scenery due to its fix risk and toxicity thereof.

I concur with those who use polyfiller or plaster over some kind of mesh structure. When watercolours are applied, plaster actually creates a very realistic impression of stone or rocks.


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