"Robatoy" wrote in
oups.com:

On Mar 28, 11:59 pm, Nirodac wrote:
HELP!!!!!
OK, now I'm stuck.
DeVilbiss Model EGA touchup spray gun.
Sprayed primer, everything worked great.
Cleaned spray gun with "gun wash" (laquer thinner). Gun was
disassembled for the cleaning. No indication of any primer was
visiable anywhere on the gun.
Reassembled gun.
The next day I went to spray the top coat, and all I got was the
spray gun back feeding into the paint cup.
The gun, when the trigger was depressed, pumped air into the paint
cup, instead of sucking the paint out of the cup and spraying it onto
the item. I have disassembled and reassembled this gun about 6 times,
even left it soaking in "gun wash" over night (only the metal parts).
Still it only blows back into the cup.
I've been trying to spray water, rather than paint, until I can get
this problem fixed. Varing the airpressure makes no differance.
This gun is so clean, you can see your reflection in the aluminum.

Ray

Was the primer water-based? If so, the thinners just made mud, which
you probably can't see.
Thinners and emulsion-based products make neat stringy stuff. Very
hard to get rid of.



Nope, oil based, thinned with Xylene. The resulting material sprayed
fine and coated well.
Top coat is also petroleum based.
Ray