I used to base buildings on old CDs. I used to have 100s of them from when I did multimedia work.

Sadly they never really worked well for buildings and so I am looking for something to base my ruins and buildings on. Ideally easy(ish) to cut and something that will avoid warping if it gets sanded.

Should I just stick to thin MDF board?

plastic card - comes in a verity of sizes but best to find a whole saler. 4x8 feet sheet is usually around 40-50$. thin enough so that its almost unnoticeable as a bace and strong enough for any thing!. didnt bother with any thing else once i found it.

Plasticard might work OK. Masonite can be good, but can warp like hell. MDF seems like it would be really heavy (and thick), but would probably work.

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Will plastic card warp if you glue sand to it?

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IIRC you can get MDF is quite thin sheets. Or maybe I am thinking of pressboard?

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Guns don't break formations. Blast Markers break formations.

My plasticard with sand glued to it hasn't warped - though I think it'll depend a little on the glue. I don't think PVA'll be a problem, though.

Thinnest MDF I've ever seen is 1/4 in. Then again, I haven't looked hard. Pressboard seems like less heavy duty masonite, which to me would mean it simply isn't going to do the job.

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I have single sheet tree terrain pieces with basically just sand and some trees and they havent warped. Only thing I found you should do if your using large flat surfaces for sand, is to sandpaper and line the side you want to glue sand to. line - just run a hobby knife across it in a grid style pattern, helps stuff bond to the super flat surface of the card. and if you REALY want you can glue 2 bases together, solid as brick, all the ruin sections from the chopped up city i did are on double thick bases and unless you purposely try to bend them , they wont budge.

Plasticard or foamboard, depending on the look you're going for. I assume the plasticard does not warp as it does not absorb the glue in most cases.

1mm for the plasticard, if you need a lot buy the big sheets of HIP sold for vaccum forming.

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Is there much variation in rigidity for plasticard? The stuff I have is still quite flexible at 1mm, I seem to recall. I guess it depends how big and heavy the piece is.

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1mm will have a fair amount of flex on it for a large piece, probably not good if you are sticking several large, solid, resin buildings onto a single sheet. For individual buildings it's fine, for multi-item layouts on large bases maybe use thicker stuff.

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I'm considering using 1/8" vinyl tiles for mine. Cheap, durable and if any paint comes off they're grey already.

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I have tiles. I haven't used them only because they are quite heavy.

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prefer mdf for basing...hardware store in the area does precut shapes that range from coaster size to dinner plate...found them to be great for basing resin buildings...its 2-3mm thick from memory...very durable...

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I also use mdf which is 3mm thick. Cheap and very durable, like Frosthammer already wrote.

Never tried the thinner mdf (1,0-2,0 mm).