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Hi everyone. I've got a dilemma.
Sorting out my plastic rubbish the other day for recycling, and I realised I really liked the shape of one of the little plastic trays that some nougat wafers came in. Upside down it looks like it'll make a nice generator building or something. It's cheap vacuum-formed plastic, but very thin. I'm not sure it will take primer and even if it does, think it'll be very flimsy. Any advice on ways to thicken it up or give it more support?
A quick google and YouTube search didn't help, other than a Lukes APS video showing him using plaster to cast Amira terrain, but this plastic is even thinner than that, and the "building" is pretty big, so I don't know it'd even support the amount of plaster needed to fill it, and I'd prefer not to have such a huge, heavy lump for a bit of incidental terrain.

Give it a squirt of expanding foam

Failing that, try a mix of sand and PVA glue: coat the inside for strength and weight

If weight is a concern - how about acrylic resin? Never used it myself, but it looks perfect for that application.

http://www.greenstuffworld.com/en/mold-making/718-acrylic-resin.html

It's fairly cheap - saw this for about a fiver on Ebay

Wyloch and I seem to be in agreement on this:

https://wp.me/p5ZE37-VO

Seriously, have used this stuff a lot, it works very well

Thanks guys. Some 'food' for thought here. Will see about expanding foam, or maybe try like the link in the last post, just giving a prime. Maybe use a smaller piece though.

The acrylic resin is ok, it produces little to no heat but the end result when i have used it has been closer to plaster of paris (as mixed to use and results).
The out side was a smooth as the mold allowed but it was brittle. I was making plasma guns in halves so it was thin. didn't crumble like plaster of paris though.