Sundeala board is used for notice boards and is also ideal for railway base boards, but needs to be fixed (screwed) to a firm surface, or it will bend out of shape if its allowed too, "A" Quality is for sheltered exterior areas, so if your layout is going to be in a damp enviroment (say a garage) you need "A" type 12 x 2440 x 1220 at about £50 per sheet, not cheap, "K" Quality is for internal work, and were no dampness is present, this comes in 6mm at £25 per sheet or 9mm at £35 per sheet, this is what i have had on my layout for some years now with no problems at all. hope this is of help
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