John:
I have used siphon feed external mix guns to paint with latex and oil type
household paints and primers successfully. I am not familiar with a Graco gun,
but I own and have used Devilbis, Binks and Sharpe guns, as well as some of the
HF copies. The key I found to painting the heavier paints is appropriate
thinning and air pressure, as well as the usual fluid and fan adjustments.
External mix is when the air pulls the fluid out of the paint nozzle with a jet
of air that surrounds the fluid tip. An internal mix combines the air and fluid
before it leaves the cup. Most guns used in the automotive trades are external
mix.
The thinning ratio and adjustments are best determined by experimenting,
regardless of what formula someone else might suggest. The ability of your
compressor to deliver enough volume is also a factor.
I think that some painters believe heavy bodied paints can only be sprayed with
internal mix equipment. An airless is a type of internal mix, like the units
used for painting houses. But adjusting fan and fluid amount is achieved by the
selection of various tips, so this becomes an inventory issue, something that
has
always kept me away from that method.
I hope I helped a little, at least.
Jim
JNiolon@uss.com wrote:
> this is so much fun !!! wood work is progressing nicely... I've got 14
> doors that I've got to paint... hollow core/6 panel/simulated wood texture
> interior doors...
>
> I want to spray them.. using Benjamin Moore industrial enamel and the paint
> man says it will spray cut no more than 25%
>
> My spray gun is a Graco automotive cup gun. A friend told me that you
> have to use an external mix instead of an internal mix (what mine is ???)
> for oil based enamel... need some guidance here... anyone set me/him
> straight... ???
>
> can I spray this paint with my graco automotive gun ???
>
> thanks
>
> john
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