It was this stuff...

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I used it in the garden inside a small spary booth because at the moment i do my modelling in my living room and this stuff has lots of overspray, maybe thats what caused the drying out? I'm in the process of trying to convert a small room into a hobby room but it's slow going....so much rubbish to sort through.  :

Next time i'll try the airbrush for varnishing.

TTFN Matt