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Good advice from Henry Taylor in the comments. A clean nozzle and proper thinning are two key things. Another is various problems with air in the wrong amounts and the wrong places. Why Your Spray Gun is Spitting is a good article on the common problems and fixes. Some of the components mentioned may not apply to your airbrush, but I'll paste the ...


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I'd try polyurethane varnishes. They are weatherproof, contrary to standard acrylic varnishes, they are transparent, but may absorb a bit of UV light, as UV is sometimes a catalyst to the reaction to form them (source : wikipedia) (only a guess here, as I didn't find valuable PU absorption spectrum). It is also stated that polyurethanes with isocyanates ...


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