I got some one shot black primer last week and today I started to prime the Flak gun. All went well for about a minute then it started to splutter a bit and stopped spraying altogether. I thought it was just tip drying so gave the tip a wipe and it seemed OK but only for a few seconds. Having decided that enough was enough I started to clean the airbrush only to find the paint had become a gooey mess inside and it took me ages to clean it, and I mean ages as some of it was so sticky I dug it out with a toothpick. So later on I thought that perhaps the .3mm needle was too small so I got out my other airbrush with a .5mm needle fitted and tried again having thinned the paint slightly with a little water but the result was the same. So, is it me, is it the paint or should I just take up knitting instead? Answers on a fully built and painted model to Useless Eustace, Scotland.