On Thu, November 27, 2008 1:52 pm, Dan Billingsley wrote:
>
> Thanks Lynn, I couldn't find a percentage...I just found an indication not to
spray in
> high humidity. Anyone else actually spray paint when this humid? The temp is
a nice 66
> degrees.
The relative humidity will drop considerably in your paint boot with all the lights
as
the temperature will be warmer but there is the same amount of absolute humidity
but
the relative humidity will drop with increasing temperature.
Since you're in the allowable range now, warming the air will make it better.
There is some variation for the type of painting you're doing too, that is, airless,
HVLP, or air pot. Double check the manuals that came with your paint gun.
The reason you are concerned at all with humidity is that when the compressed air
expands and some of the solvent evaporates, both cool the spray. If the spray
temperature is below the dew point of the surrounding air, then you get orange
peel
effect on the painted surface. So if you're using a compressed air type application
be
sure you have a drier in the air supply too.
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
