How long can you safely leave water-based varnish in an HVLP gun?

[fisheye]

Thanks.

 

[tjbnwi]

I don't leave the products in mine at all. Never have and that's going back 40+ years when I used to shoot automotive lacquer. If you want to be able to store the product in gunable condition, get the 3M PPS system for your gun. Pop the liner out, cap it, rinse the gun.

Tom

 

[Scott B.]

Not very. Much easier to break it down and clean when things are wet. Peeling skins out of internal parts is just not fun. If I am in between coats or taking lunch, I will wrap a wet rag over the tip, but not for more than a hour.

 

[tiralie]

I don't leave the products in mine at all.

I don't either. While it is a chore, it's easy to flush the gun with water between coats. I hate the spatter from a clogged gun.

If you want to be able to store the product in gunable condition, get the 3M PPS system for your gun. Pop the liner out, cap it, rinse the gun.

Agreed. When you are only spraying a small amount, the time savings of the PPS system is invaluable.

Tim

 

[junk731]

My main finish is Target EM2000 and that I leave material in the gun all the time and just top up the PPS Cup. It might get cleaned once every 2 weeks. When using pigmented WB I clean up at the end of the day. I also have a gun for shellac thats always full. These are all gravity CAT H2O guns and never had a major problem when shooting clear. I should also say that when not in use the guns are upside down so the flattening agent in the clear doesn't settle in the tip.

John

 

[greg mann]

So the guy wanting advice on finishing is Fisheye, and the guy who can get away with leaving his guns loaded goes by Junk. No offense , guys, but I think that is just too funny. [poke]

 

[mastercabman]

So the guy wanting advice on finishing is Fisheye, and the guy who can get away with leaving his guns loaded goes by Junk. No offense , guys, but I think that is just too funny. [poke]

That is funny!

As far as leaving waterborne product in your gun,
I have been told NOT to do so.

 

[junk731]

Not bad Greg. LOL In my case the nickname came a long time before the internetwas around and is a true reflection of what I feel most information/advice is from the internet. This forum does, IMHO have a higher percentage of good advice.

John Kee

 

[junk731]

"As far as leaving waterborne product in your gun,
I have been told NOT to do so."

I heard the same advice, I just didn't listen and have experimented with various products in my gravity guns made for WB product. Most clear WB based finishes, with the exception of post catalyzed products, I haven't had any problem. If I had a gun without stainless passages and attachments or a typical bottom cup gun I wouldn't leave product in the gun. The reason it works, in a gravity gun is there is no exposure to outside air so the product can't cure just like in the original can. At least now you have a differing opinion to commonly given advice and possibly make up your own mind.

John

 

[tiralie]

...I just didn't listen and have experimented with various products in my gravity guns made for WB product.

John
LOL...like you, I don't listen either...something definitely wrong with me...
I have never been told not to store varnish in my gun but after several long spraying sessions I have noticed significant degradation in the spray pattern forcing me to stop and clean the needle and cap so logically I felt that the longer the coating sits in the gun the worse the spray pattern gets. I am usually messy, but for some reason I am extremely fussy about keeping my guns and spray equipment clean.
Tim

 

[fisheye]

So the guy wanting advice on finishing is Fisheye, and the guy who can get away with leaving his guns loaded goes by Junk. No offense , guys, but I think that is just too funny. [poke]

Fisheye was my bachelor fishing boat. Got wife, needed a few more creature comforts and we bought a bigger boat. I promised it after her. I do, however, refuse to go by "Miss Pris", so you guys are stuck with Fisheye.  [laughing]