Varnish left white residue

Did you stir it before airbrushing?

It was an aerosol, first time I've used it, wish I had used my tamiya flat clear

My guess is you sprayed from too far away, and the paint partially dried in the air.

I think it's happened to most of us. It has to me.

I have a FW-109 in my case with a milky-white matte finish to remind me of the mistake.

You should be able to fix it with a semi-matte or gloss varnish right over the top. That was Stik's advice to me years back and it's worked every time for me. Just spray it heavy and close, keep the can moving. Or use an airbrush if you can.

Thanks Greg, appreciate your help, I think I will stick to the airbrush from now on, and will try to give it another coat 

I have a trick for you. I use the spray varnishes all the time and a legendary car painter taught me that if you take a large container of hot tap water (I use a big bucket) and let the rattle can sit in there for 15 minutes, dry off the can and nozzle and then shake it for 5 minutes the contents will be perfect for spraying. I do this every time and its never failed me.

The paint and carrier in the can gets smoother and atomizes better when its warm. Hot tap water is not enough to cause unexpected explosions (unlike throwing rattle cans in a fire or microwave) so you're safe there. 

Lord Voyager

I have a trick for you. I use the spray varnishes all the time and a legendary car painter taught me that if you take a large container of hot tap water (I use a big bucket) and let the rattle can sit in there for 15 minutes, dry off the can and nozzle and then shake it for 5 minutes the contents will be perfect for spraying. I do this every time and its never failed me.

The paint and carrier in the can gets smoother and atomizes better when its warm. Hot tap water is not enough to cause unexpected explosions (unlike throwing rattle cans in a fire or microwave) so you're safe there. 

 

That is the oldest trick in the book. I used to do this during the 80s. I've never heard of anyone sticking a rattle can spray paint in the microwave or fire to warm it up.

Acrylic varnish is not true, old fashioned varnish.  It is quick drying, whatever solvent they use, and therefore may be susceptible to blushing in high humidity.  Blushing occurs when you have a high dewpoint (humidity).  The rapid evaporation of the solvent cools the surface below the dewpoint causes water to condense on the surface with microscopic roughness that appears white.  Try sanding with very fine sandpaper, such as 1000 grit, and coat again when it is very dry weather.

The milky MM clear acrylic flat is another product that does that to me every time, leaving a whitish dusty effect so I stay away from it.

Spray gloss lacquer to restore the finish then shoot some Testor's clear flat lacquer for a dead on flat finish.

Ok thanks for the advice 

Wow, that's something I've learned, cheers 

Don Stauffer

Acrylic varnish is not true, old fashioned varnish.  It is quick drying, whatever solvent they use, and therefore may be susceptible to blushing in high humidity.  Blushing occurs when you have a high dewpoint (humidity).  The rapid evaporation of the solvent cools the surface below the dewpoint causes water to condense on the surface with microscopic roughness that appears white.  Try sanding with very fine sandpaper, such as 1000 grit, and coat again when it is very dry weather.

 

 

Yes thanks Don, people like you with your experience,  keep teaching us novices, 

If using a spray can.Shake very well after letting the can ln warm water for about 10 min.