Regarding the previous post: Shordzi asked about the brand of paint stripper I used to remove the hand-painted brown finish (I think it is model maker's enamel). The can recommends 40 minutes. I left it for 10 before dunking in a bucket of water, brushing and rinsing it off.
Warning: This softened the decals to some extent, especially on the back of the frame where I left it on for about 15mins. This means that the writing is indistinct. The underlying original finish seems unaffected by the stripper.