Brad Carter on tue 21 mar 06
I was thinking of buying a HVLP spray gun to apply exterior paint to my
house and also to apply oil-based polyurethene to furniture. I was thinking of
getting the HVLP spray gun offered by Geil Kilns with the idea that I could
also use it to spray on glazes and slips. Does anyone have any comment about
this? Good idea? Bad idea?
Brad Carter
Grass Valley, CA
Maurice Weitman on tue 21 mar 06
At 14:06 -0500 on 3/21/06, BRADCARTER@aol.com wrote:
>I was thinking of buying a HVLP spray gun to apply exterior paint to my
>house and also to apply oil-based polyurethene to furniture. I was
>thinking of
>getting the HVLP spray gun offered by Geil Kilns with the idea that I could
>also use it to spray on glazes and slips. Does anyone have any comment about
>this? Good idea? Bad idea?
Hello, Brad,
I'd say that the nozzle size of the Geil (2.0 mm) might be too large
for house paint. Compare it to the sizes typically supplied with
guns for use with house paint. Polyurethene is another matter, but
I'd say it's still not as thick as most glazes and certainly slips
for which the Geil gun is sold.
Harbor Freight used to sell replacement/additional nozzle sets for
their guns. Geil doesn't, sadly. Perhaps you could check with H.F.
if you wanted to use the same gun for a wide variety of material,
Regards,
Maurice
F. Parker on wed 22 mar 06
In general, HVLP guns require much larger compressors than siphon or
pressure-feed internal or external mix guns. Also, to paint a house you
will need something that puts out a lot of paint. Much less is needed for
furniture or glazes. Usually, a gun designed for spraying a relatively
light coating will not work for a house. Housepainters typically
use "airless sprayers" which use no compressor at all, but rely on very
high hydraulic compression of the paint before discharging it through a
small orifice. In an airless gun, the paint is discharged at such a high
pressure that it breaks up into an atomized spray when it hits air. A
huge volume of paint can be applied by these things, and moderate breezes
are not a problem, as they are with HVLP and conventional airspray
equipment.
Nother factor to think about is the relative viscosities of the materials
you plan to spray. In general, paint spray guns do not come in a "one
size fits all" version re viscosity. Most house paint is relative thick
and heavy. Most furniture finishes are very light. Glazes can be thinned
to moderately light. Intuitively, I wouldn't think something made for
glazes would be good for houses. Maybe furniture...
I haven't used the Geil Kiln gun you mentioned, but I have used just about
every other kind of paint spray gun, including HVLP. The "HVLP" says a
lot (high volume low pressure) about compressor requirements. If you
don't have a high volume compressor be sure to find out what the volume
requirements are for any gun you buy. You might have to also buy another
compressor.
I once applied an oil stain to a cedar house I was planning to sell, using
a conventional airspray gun and a Sears compressor (home model). I
finally finished, but it took three times as long as I thought, and at
least twice the amount of stain I estimated. The result was a splotchy
house. My gun was designed to paint lawn mowers and Aunt Tizzy's old
dresser -- not houses.
My advice: if you want to paint a house go to Home Depot or a paint store
and rent an airless sprayer. For spraying glazes, get a gun designed to
do that. Good luck.
Fred Parker
On Tue, 21 Mar 2006 14:06:37 EST, Brad Carter wrote:
>I was thinking of buying a HVLP spray gun to apply exterior paint to my
>house and also to apply oil-based polyurethene to furniture. I was
thinking of
>getting the HVLP spray gun offered by Geil Kilns with the idea that I
could
>also use it to spray on glazes and slips. Does anyone have any comment
about
>this? Good idea? Bad idea?
>
>Brad Carter
>Grass Valley, CA
>
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