In article 8a91b6cf-4e93-4e68-a62f-
,
says...

To get a good, comprehensive answers to your questions, it would be
easier for you to simply search this group. The subject of HVLP
spraying of water borne materials has been discussed completely
several times.

Any time you have spraying errors you can have a *multitude* of
problems that will generate poor results. Some mimic others, so it is
best to get a list of common spraying problems and their diagnosis and
begin from there with your own equipment. I spent a lot of time
writing out the way to properly set up your gun for spraying a long
while back, and I was contacted by more than a few that thought the
info I put out was helpful. It might be to you as well.

FWIW, I think Rob may be on to something. MOST guns (not all) that
come with one tip use a 1.4 to 1.7 mm tip. If you are in that range,
it might not be large enough to spray your finish without thinning.
If you didn't get another tip with the gun (the 2mm is intended for
unthinned latex), try thinning your material about 10% with distilled
water, then shooting it.

I would also suggest that you find a good book(s) on spray technique.
There are a lot of good ones out there, and they can help you
troubleshoot your problems. Some of those books will help you
realize that there are too many variables to troubleshoot ACCURATELY
without a ton of info. They may also be able to help you figure out
what you are doing wrong as well.

Plan on investing some time and money in learning the spray process.
It is no different from any other part of learning a craft, but it
seems to be the biggest enemy of wood workers as they feel like it is
something that they can learn from osmosis. You can spray material
out of a gun by simply hooking it up. But to shoot a well laid,
consistent finish is something that takes time, practice, and above
all, patience.

Note that getting larger tips for the HF gun may be problematical--I
tried to get a larger one for mine and the gun had been discontinued as
had the tips. They may be available for the replacement model.

While the HF purple gun is fine _if_ out of the box it does what you
need, I've found that tcpglobal has what appears to be the same gun for
not a lot more money and they have a wide range of tips available, as
well as repair kits and accessories. Their tips work on _my_ HF purple
gun but mine isn't the current model.

Note--assume that the regulator that comes with the gun is dead, not
just with TCPglobal but HF as well--I've gotten one good one out of four
guns purchased.

If the tip is too small then you pretty much have to thin.