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The humidity can haze up your finish. It’s fixable, but you’ll waste your time and nitro and only wait for the weather to get good again.
This is important. If the humidity is too high, the nitro will absorb moisture as it passes through the air. This trapped moisture causes a milky bloom in the finish, which can be hard to get rid of.
I use the BBC weather app, which forecasts relative humidity for each hour, as well as keeping a cheap digital hygrometer in the garage, just to make sure. Ideally it should be below 60%. Of course, you can go most of the autumn and winter in this country rarely seeing it go below 80%, in which case the only way to do it is with lots of very thin passes, and hope for the best.
When I sprayed my body I had a similar set up to @rodan. I didn’t have the bike stand but my bit of wood attached to the neck pocket had a hook and string so I could hang it from the ceiling of my shed.
I vacuumed and dusted as best as I could before spraying and had no extraction except open doors. I think you’ll have to be very unlucky to get any flies stuck to it.
I think the main thing to factor in is the great British weather if you’re spraying outside or in the garage/shed. If it’s raining or about to rain, don’t spray. The humidity can haze up your finish. It’s fixable, but you’ll waste your time and nitro and only wait for the weather to get good again. Be patient! I wasn’t.
But I got there in the end.