Ah makes sense. So not a new batch like you thought. That was my second post thought, as dryfall has a short shelf life. The chemical that makes it fall dry, doesn't last long. Also a note, is to always have the store shake your paint even if its not a tinted color.

 

All I can say is that is a pretty wide array of different tips sizes. I'm guessing if you are getting tails, its the 517 bringing down the walls, otherwise it shouldn't matter too much with the small tips and spraying little pieces. What could be happening is something with your pump. The pump may not be bringing enough pressure to atomize properly. That would be the one thing not mentioned in your equation. If you started well with dryfall, then are noticing tails with more of it, then thinning to help, it may be your pump. Dryfall is pretty harsh material, it may just be something small that ate away at a seal or the material may be wearing on the rod? It doesn't take much to drop pressure. Another thing to check are your filters. Clogged up filters will drop pressure quicker than anything, gun, pump, intake. Let us know what happens.

 

Thank you for all your suggestions Mike. I eliminated the possibility of it being a painter issue as I have 3 painters on site and the all do the same thing. Tried a pail of dulux dryfall I had left over and it sprayed beautifully. Talked to my paint rep with SW and he said he scrambled to find the extra 5 pails I needed and pulled it from a warehouse it was sitting in for who knows how long. Bad paint. They are replacing the 5 pails with a100 to finish the walls.
Thanks again

 

213, 311, 415, 517. 50ft of line. It is a new batch. It was shipped to site by truck

 

What size tip? How much line are you running? This new trouble paint. Did the store have to run and get you more or was it pulled from the same batch they brought in for you?

 

150 gallons is well exceeding the amount that tips last. If you started with a particular tip, just try a new one.

 

Brand new tips, same results