I`ve had this happen to me also Stuart , I don`t think its a reaction with the paint as I done a test on my turn table and it looked like it was covered in fur after , I gave the ab a good clean with cellulose thinner tried it again and it sprayed out ok , I take it its the pre-thinned laquer and not the two pack stuff that comes with a hardener if so I`ve heard others have also had the same issues on F1M , what I do now is fill the cup and spray a coat , empty the cup back in the bottle and run a lttle thinners through the ab , 10-15 mins later fill the cup coat up model again empty cup little more thinners again - you get the picture , in doing this I`ve not had any issues since and takes no time at all , what I don`t do is let the stuff sit in the cup between coats anymore , letting it sit is maybe related to the problem or maybe not who knows
Hiroboy are very slow with returning emails it might be better phoning them , let us know what they say I would be interested what Steve advises , saying that the method I now use seems to work for me with the pre-thinned laquer , the 2 pack stuff is ment to be superb if you get the mixes right.
Cheers
Richy