I bought a quart can of Flexible primer for my bumpers. I followed the instructions and set up my spray gun as suggested. it said do not thin - stir until consistent color

When I started the paint spray was very light. So I slowed my motion down to get better coverage. After a few rows I noticed the paint was making a cob web type mess. I could see it all over the floor and on my clothes.

Have no clue why this was happening or how to fix it. my only thought is the paint is bad, even though was it new and unopened.

Any one else ever experience this?

 

Sounds like it need to be thinned ....

 

Id also suggest adding some thinner to it even though it said not needing thinned... Also did you accidentally read the part where it said how to apply using a roller or brush and not the paint gun section?

 

I agree with the two above. The reason they recommend not thinning may be as simple as to stay within voc laws in the product sheets. Maybe the solvents mixed in it are too fast, like acetone,as well.
I remember back starting out when we used lacquer thinner, and having occasions where it was warm and on a few occasions would want spray out stringy and dry and rough, lacquer thinner is a pretty fast solvent.
Make sure your vent hole is free in the cup if siphon, or in the cap if gravity, and that you have enough fluid and that it is mixed well so that solvents aren't sitting on the bottom of the cup. If these all check out okay, try experimenting by thinning some with a good grade solvent, a slower speed urethane reducer.

Another thing, maybe some may disagree with me, but if using modern urethane paints and primers are pretty flexable that I don't believe a special primer or adding a flex additive is needed. I just use either a regular epoxy or urethane primer on parts such as urethane bumpers. I never personally waste money and add a flex additive or use a flexable primer. I seen a urethane bumper that I painted once, that the kid totalled out soon after. The bumper was twisted around, but other then the point of impact, paint was still adhering fine. If you are painting a plastic that calls for an adhesion promotor, that should be used. But I am not really sold so much on flex additives or flexable primer. Most important I believe is a good washing with warm soapy water or ajax, wipe down with a wax and grease remover or plastic prep, sanding well and rewipe before paint or primer.

 

I'm with Kenseth on this one, I'm betting you will have to thin it some or have a clog in the gun somewhere.

I also agree with you on the flex additives, I haven't used them in years and have never had an issue.