Any wisdom on settings for both air and material flow through an HVLP
sprayer that work best for spraying shellac?
Sprayed my first shellac on a project over the last two weekends with an el
cheapo HVLP turbine sprayer (CH) I purchased for starters.
RH was in the 90% range and I had no problems with blushing ... which I may
be wrongly attributing to using 99% isopropyl for the 1# cut I mixed from a
3# cut can of amber Bullseye.
At the outset, I had very slight orange peel on a couple of upper edges of
my test piece, which I attribute mostly to technique. This disappeared once
I kept the nozzle parallel to the piece and both stopped and started past
the edges.
The results on the actual work was more than satisfactory, and I like the
results so much that I may upgrade to more adjustable apparatus.
Thanks.
--
www.e-woodshop.net
Last update: 7/28/03
Hi Swingman,
Do you have different needles and nozzles and air caps? I check the viscosity
of the solution and pick some combination that should work (as stated by the
manufacturer) in that viscosity range. I then spray a horizontal pattern until
it starts to sag. If it sags in the centre of the pattern the air cap is too
large. If from the extremities, air cap too small, a figure 8 pattern, air cap
too small or air cap too close to the fluid tip. Hope this is of some help.
Cheers, JG
Swingman wrote:
> Any wisdom on settings for both air and material flow through an HVLP
> sprayer that work best for spraying shellac?
>
> Sprayed my first shellac on a project over the last two weekends with an el
> cheapo HVLP turbine sprayer (CH) I purchased for starters.
>
> RH was in the 90% range and I had no problems with blushing ... which I may
> be wrongly attributing to using 99% isopropyl for the 1# cut I mixed from a
> 3# cut can of amber Bullseye.
>
> At the outset, I had very slight orange peel on a couple of upper edges of
> my test piece, which I attribute mostly to technique. This disappeared once
> I kept the nozzle parallel to the piece and both stopped and started past
> the edges.
>
> The results on the actual work was more than satisfactory, and I like the
> results so much that I may upgrade to more adjustable apparatus.
>
> Thanks.
>
> --
> www.e-woodshop.net
> Last update: 7/28/03
That it is ... thanks for the tips.
--
www.e-woodshop.net
Last update: 7/28/03
"JGS" wrote in message >
> I check the viscosity
> of the solution and pick some combination that should work (as stated by
the
> manufacturer) in that viscosity range. I then spray a horizontal pattern
until
> it starts to sag. If it sags in the centre of the pattern the air cap is
too
> large. If from the extremities, air cap too small, a figure 8 pattern, air
cap
> too small or air cap too close to the fluid tip. Hope this is of some
help.