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Any paint sprayed from my airbrush doesn't seem to be setting hard.

GW's temple guard blue seems to wear off edges, Vallejos grey surface primer peels off and now the vallejo varnishes have just peeled off of my guardsmans shoulder pad. I figured that the varnishes are supposed to give a harder wearing finish over GW paint so I tested it on some old models. A few days after spraying I ran my nail across it to test the durability. The varnish broke easily and the whole shoulder pad covering peeled off, the old paint underneath (not airbrushed) wasn't touched when i did the same.

- The paints had been left to dry from anywhere between a day to a few weeks.
- I thin my paints will Vallejos airbrush thinner.
- I live in the UK and use my airbrush indoors with an extractor so I would imagine humidity / heat shouldn't be a problem.

Can anyone think of a possible reason for this or am I expecting too much from my paints?

Ok thanks for that guys, it seems unanimous that the issue is too few coats of paint and varnish and Vallejo primer just isn't that great.

JamesY - I'm applying everything with my airbrush.

OgreChubbs - The models are plastic, I have never washed my models before painting. Does it make a noticable difference?

 Buttery Commissar wrote:
How long are you leaving the primer to dry for?

The primer was left for well over 24 hours