Just wondering if it's possible to spray oil-based poly with a good
air-type sprayer (not HVLP either), and not get a bunch of bubbles in
Any tips or experience here? Yes, I know, everyone should have an HVLP
and an airless sprayer, but let's just assume that I don't.
"If you can't beat them, arrange to have them beaten." ---George Carlin
yeah, I've done it several times with no prob. Like Jim says, watch the
temp, make sure you have eye protection and a good respirator and most
importantly.... if you do this stuff in the garage like alot of us do, make
sure the car isn't parked right in front of the garage door. Kinda self
critiquing, and makes a hell of a mess on a car when the overspray settles.
With the proper needle/nozzle combination and the right viscosity you can
successfully spray any liquid.
The two biggest thing to keep in mind if you are spraying an oil based
varnish (especially with a conventional system) is that varnish stays in
tack for quite some time. This means any overspray and bounce back is going
to stick on to anything it touches.
That brings us to the second thing. Unlike shellac and lacquer, varnish
doesn't have a solvent. Once it cures nothing but some high test strippers
is going to get it off. Messy and possibly destructive for things that get
hit by the overspray and bounce back. What the military would call
collateral damage. That little problem also means that you not only have to
be careful of things in the spraying area but you MUST clean the gun if you
are not going to be spraying for even a short period of time. The varnish in
the cup may not be a danger for some time but that thin coating on the
internal passages of the gun and feed tube is a different story.
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