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Experiments with expanding foam

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I know about the craft article on filling a bucket with sand and spraying foam in the space carved out.  I don't have a ton of time so didn't do that. I DID take a few sheets of parchment paper, a few sections of plastic fruit containers lined with parchment paper, and sprayed a can's worth of expanding insulation foam to make some hills.

Because of needing to get by with a stroller, foam was packed up after an hour to continue curing.


In a few days I'll seal with brown craft paint and modgepodge, then experiment with flocking.





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Yikes, that's still off gassing a ton. Back outside to air. Doesn't seem to be expanding any more. Really rigid already.

Anybody have tips about cutting it? (other than wear a mask).

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12 hours ago, BLZeebub said:

Super-new breakaway razors are great.  Not sure if a hot wire cutter would do it, but I bet it would (outside of course!).

Ditto on the razor knives.  Do not worry about hot wire cutters.  You can also use bread knives or sharp serrated knives.  I have not found much use for the foam aside from backfill for solid structures. 

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I'm really just experimenting. I think a few can be used as hills or rocks. I'll have to see.

Plan on cutting a few so they lie flat then will seal and flock as appropriate

I got about 1.5 x 2 ft of surface from one can. About 1 inch deep mostly 2-3 for some I was trying to get higher.




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Ugh that looks disgusting. Will totally need another coat of paint and modgepodge. Places I cut are super absorbent. Might add some grey for stone in a few spots and blue for ice /snow. Don't think I'll leave any just brown. More stuff here than I can hope to use really. Will pick out best pieces and practice on rest.



Edited by lexomatic
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I have no ice terrain let's work on some of that... I won't even have to do any flocking so it'll be fast. That said I love the irridescence. Next comes sponge white... Maybe many coats. There are 3 kinds of blue here. Last 2 pics have stippled turquoise. Others just navy and teal.





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Super happy with how things look after sponging on white



Less happy with other stuff. Tried sponging brown then green on some to be flocked pieces. The big one is always gonna look weird... Landfill? It looks like moldy home made bread.

The smaller flatter piece looks better, but I won't be able to get some of those deep yellow bits. Debating making sides a grey stone but okay with stuff so far. Green has really faded on that one





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We had a little hobby time get together at my FLGS and I had them put the Terrain Tutor on the TV while we beavered away.   As it happened his video about using expanding foam was in the rotation and as far as I noticed he sold it as something to use if you couldn't get  the sheets of insulation foam.   Also as far as I saw, he made a point of cutting away all the skin as he formed his hills.


Just something that popped up and made me think about this thread.  In any case, I think that the last few pics show an interesting texture  It might be interesting to make a big mold out of aluminum foil in a bucket of sand and see what kind of rock you could make that way.   

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2 hours ago, lowlylowlycook said:

1)point of cutting away all the skin as he formed his hills.


 2)It might be interesting to make a big mold out of aluminum foil in a bucket of sand and see what kind of rock you could make that way.   

1) yeah would be easier but require way more of something to seal/prime.

2) I kinda did this for a few things

Had some rough forma from aluminum food trays that I shaped then lined with parchment for easier tearaway . Would just do the foil another time but not sure how to protect from sticking


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Getting back to this. Trying to figure out how to salvage my big piece (hinted at in graveyard thread and reposted here). May cut more off and also spackle a bit to even it off, and then flock the top.20200523_105806.thumb.jpg.6c3689281497c1cc3824c43a3ddae038.jpg

Have done the smaller hill as scatter (will eventually base it on tough chipboard I have from various mailers but need to find). I want some scatter for my graveyard/cemetery.






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