QUOTE I have tried weathering with water based poster paint, mainly wagons and coaches. I use the same method
Thanks, Patrick. That sounds like what I need to do. I have water-colours and gouache (which is similar to poster colours).
As a child I repainted my Princess Elizabeth in maroon (using Humbrol paints), but eventually washed it off with thinners - or was it turps? can't remember. Washing it off like that didn't seem to do any harm, but as I've got water-based paints (also oils and acrylics, but I think they would be rather more permanent) it would be nice to use them for 'removable weathering.'