" wrote in
ps.com:

On Mar 29, 11:23 pm, Nirodac wrote:

Primer was "Crown Rust Paint" containing petroleum distillates.
Thinned with Xylene.

If it is a Crown product, it is pretty generic stuff, so there weren't
any high powered solvents needed. I don't know that it would make
much differnce since metal primers are mostly solvent anyway, but why
did you use Xylene?
Cleaned it several times now, once after reading this post. Same
thing no change. Still bubbling air into the fluid pot.

WTF, over? How would you know that? Are you sure this is the gun you
have?

http://tinyurl.com/355cnk

Don't look at the stuff the guy did to the gun, just the starting
pic. Like any other high pressure gun that sucks the paint up the
pickup tube, you would never, ever see any bubbling unless you had a
clear can on it.

So... are you using the gun with the 6 or 8 oz cup, or are you
actually using a another resevoir? If you are using a resevoir, the
little venturi on this gun was never made to suck finish through three
feer of line to get to the gun.

And bubbling is not good - something isn't set up right. I don't have
a clue how you could see that on a high pressure gun/can combo.

The fluid path up from the pot to the fluid needle chamber in the
barrel and then out the barrel past the air cap is as clean as it can
be. It's almost like the venturi effect isn't working.

Let's take this a little further, too. After a good cleaning to make
sure I have the gun ready to go, I always spray some kind of thinner
through it. When for the last time wash it is clear, I am happy.
Have you tried this? Will yours spray thinner, or are you trying to
spray a finish when you are testing?

Usually I read the instructions on the can (don't tell my wife I read
instructions)and thin the fluid with whatever the manufacturer
recommends.

That's good news. A few years ago I finally decided that I had made
such time consuming, costly mess out of so many things I always read
now. It elminated so many uncessary problems I do it all the time
now. It's a dirty little secret of mine.

I'm willing to hang with you on this to see if we can get it solved if
you want. Please make sure you have the exact model of gun you
described. The post more detailed info addressing the bubbling (??),
type of finish you are trying to spray, whether or not you tried plain
clear thinner, and what type of paint resevoir you have on the gun.

Ray - everyone that sprays has problems like this from time to time.
I have a small Binks knockoff that I cleaned front to back too many
times to count when it was acting up, and every time there was just a
tiny little spec of something stuck where I couldn't see it that
screwed me up.

This is just part of it, as annoying it is. This is why it is
important to clean the guns as well as you can after every use. I see
folk's guns that look like they have been spraying black weed killer
and battery acid out of them, and they can't figure out why they don't
work better.

My little detail gun isn't spotless, but pretty close, and until I
went to my HVLP system I used it for everything for years. So you are
certainly on the right track there.

Let me know.

Robert



Boy, you guys are just loaded with great information.

I may have found the problem.
After I sent my last post, I decided to go over everything just one more
time, with a magnifying glass (the old eyes aren't what they used to be).
Seems that I have a small crack on the fluid tip where the fluid needle
seats behind (internally) to it.
As luck would have it, there is a DeVilbiss dealer here in town, so later
today I'll drop by and get a new tip (and needle) and packing.

But to answer some of the questions you guys asked.

1. 6 oz medal cup, pressure system.
2. I can hear the bubbling in the cup (x-ray vision has failed me!)
3. Exact model is DeVilbiss EGA-502 (can only find a 503 on the net,
looks the same (even the exploded views are the same, part numbers
slightly different)).
4. Xylene was handy, and it did the trick. Normally would have used
paint thinner. Xylene I found causes the product to dry faster in colder
weather, my current shop isn't heated yet (still building my woodwork
shop).
5. I do ususally clean my guns really well, and infact that my have been
what caused my problem here. I had removed the spary tip to clean the
barrel one to many times.

Thanks for everyone's help so far. I'll let you know the outcome of the
new tip replacement.

Ray