Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

So, from my previous experiences, normal cereal box cardboard warps a lot. I read somewhere that the cardboard in GW boxes won't warp when sprayed/glued/painted, is this true? I need to know, because I'd prefer not to steal posters of the buses to get plasticard.

No such thing as a paper based board that will not warp when wet. Sorry. I suggest heading to a model train store and picking up some sheet styrene.

What are you planning on doing with this material?

One trick if using corrugated cardboard for building is to alternate the direction of the layers. Helps prevent warping.

Cardboard that has been impregnated with resin or cyanoacrylate glue, making it significantly more time-/effort-/cost-intensive than is even remotely worthwhile. Better to spring for styrene or restrict your card use to cladding which, being fully adhered to a solid backing, isn't liable to warp.

Foam core is a pretty good alternative when it comes to making buildings. Comes in 3mm, 5mm and 10mm (and maybe some more)

It is basicly two sheets of cardboard with foam in between making it a sandwiched material. It holds its form way better and is nice to work with.

http://www.mattonbutiken.se/index/product/id/123907/search/kartong/CELLPANNA_SVART_5MM_.html

One thing to note when making something of cardboard is that painting both sides at the same time somewhat cancels the warping. So doing a building you should paint inside and outside basecoat at the same time, and painting the base you should paint the bottom and top side at the some time then let it dry. The next layers will not be a critical.

There's that really thick, coated cardboard, like the Space Hulk floor tiles (very shiny). I'd wager that if you were to prep it with gesso, it would paint just fine.

However, I like Granader's idea better -- foam core is what the pros (architectural companies) use to make building mockups.