I started to use Future in May 2013 and had no problem spraying it until recently. I use a 20 psi and spray from 4-5 inches away from a model. Nowadays, Future tends to be runny. Is it because it's winter? That is, it's possible that Future doesn't dry as fast as it did in the summer.

Never had winter/summer issues with Future.

If you are using a DA airbrush, try to easy up on the fluid
to air ratio or try to lower your pressure slightly.

Cheers,
Joe

Ditto what Joe said.

Drop the pressure to your AB down to about 10 psi.

Steve

Keep it light (lower fluid), friend!

It MAY be that temp and humidity are affecting things a little - but sounds mostly like you are simply getting too much on at one go. Apply thin coat and let dry a bit and re-coat just as needed for your purpose.

Bob

I have to paint outside and can say from experience that the temperature and humidity are major factors. I have had the same problem, before. You need to apply several light coats and let them cure for at least 30 minutes in between sessions. The good new is, with these conditions you will attain a brilliant gloss coat.

Because I was dying to apply oil washes on a 1/35 Hetzer, I guess I was impatient and tried to "soak" the model.

I sprayed Future @ 15 psi lightly a few time and it didn't run at all.