I've recently completed the build of a 13T Steel Open wagon, an etched brass kit bought second hand from ebay. Having never painted a wagon in Bauxite before I purchased a bottle of RailMatch Bauxite 323, along with Weathered Black 412, Early Freight Grey 322 (all enamals) and matt varnish.
I airbrushed the chassis (2 actually) in Weathered black thinned as I normal would with Humbrol paints. All was good, in fact I was very impressed with the RailMatch black. Next day I thinned the Bauxite ready to spray but instead of it thinning it actually seamed to thicken and separate. I tried 2 different brands of thinners, white Spirit & cellulose none of which mix with the paint. I then purchased the brand of thinners recommended by Railmatch which arrived today. A quick test reveals the same results as previous !!
Any suggestions, any previous experience of this problem ?