posted
I would like to know why people are having a hard time getting latex to lay down on a good spray. No matter what brand I use I lay it down good, no penetrol or nothing.
Could it be the guns? the pressure? what are you guys using on this board to spray with?
-------------------- You ever notice how easily accessible people are when they are requiring your services but once they get invoice you can't reach them anymore
-------------------- You ever notice how easily accessible people are when they are requiring your services but once they get invoice you can't reach them anymore
posted
I was spraying gloss in both impervex and porter, and the impervex seemed very finicky. I had a hard time getting the same finish twice. I also had trouble with dark colors looking hazy.
The porter seems more forgiving and the coverage is better.
Again, this is just my opinion, subject to change, and certainly NO expert.
-------------------- Eric Houser Eric Houser Signs Richmond, Va Posts: 74 | From: Richmond, Va | Registered: Feb 2004
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posted
I think we have confusinon on here...IM NOT HAVING A PROBLEM SPRAYING LATEX. I was asking why eveyone else is. and Si of course I dont know what penetrol or flowtrol does or does not do.... I have never used either.
-------------------- You ever notice how easily accessible people are when they are requiring your services but once they get invoice you can't reach them anymore
posted
By trial and error, I'VE ended up at 30psi on a campbell hausfield multi-purpose gun. Much lower and it splatters, go higher and it seems I lose half my paint.
I know some here use HVLP guns, but I havn't gone that route. My concern is nozzle size, lots of different nozzle sizes on HVLP guns, and I don't know which is best.
Any tips are appreciated!
-------------------- Eric Houser Eric Houser Signs Richmond, Va Posts: 74 | From: Richmond, Va | Registered: Feb 2004
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posted
When in the Model Business we use to reduce the new Acrylic Latex paints (I think they were the Badger brand and Tamiya Acrylic) with Denatured Alcohol. I am not sure if the formula is the same for House paints so I would definitely do a test before spraying it on any signs. But I do know I could get great coverage the do the details in oil on top(Weathering and washes)
[ January 30, 2007, 07:17 PM: Message edited by: William DeBekker ]
For me this has become second nature and I seldom consider or worry about any problems spraying latex. That said, I don't spray much gloss but most other finishes lay down very smooth. Like Bob I use a HVLP. I bought a cheeepie at Harbour Freigh, $65 bucks. I keep another one one the shelf in the box, just in case.
Dilution is allways different, since the last bit at the bottom of an old bucket, is thicker. Also some brands are thicker. You get a Kentucky windgage with this stuff after a while. In a quart mixing can I use about three or four tablespoons of flowtrol and about a 1/8 cup of water. Once strained and in the gun, a quick test. I may add more paint or water which ever is required.
Like Bob, I turn the pattern allmost closed and the pressure up, lets say 90psi. Then I throtle it back and adjust the pattern to get a nice atomized distribution. Most of my work is done flat and that makes the process much less critical. I've never looked, but I bet the PSI is about 70 when I ready to go. Doesn't make much difference because when the pattern and flow is correct you'll know it.
It takes about three coats to get good coverage. Some colors like red and yellow may take more. The first two coars are light and must be allowed to dry very well. I've found latex doesn't cure out in quickly. It can take days, depending on temp and humidity. However most painting is finished in a day and allowed to cure another day before applying vinyl.
One technique I like to use on background panels is to darken down the corner. To get a smooth transition I use approx 30 percent clear added to my color which has been darkened way down. This will allow you to make several passes, until you get the affect you're happy with. The pattern should opened up a little and the pressure throtled back.
I get my clear at Wallmart for about $12. a gallon. It's under their Faux products. Exterior grade and hasn't given me any trouble.
My favorite painting technique remains the roller.
J
-------------------- Joe Crumley Norman Sign Company 2200 Research Park Blvd. Norman, OK 73069 Posts: 1428 | From: 2200 Research Park Blvd. | Registered: Sep 2001
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posted
My apologies I went out of town. I spray very high pressure. I have no idea what because all the pressure gauges are broken on compressor and at gun. Its the highest pressure I can spray at. Every paint is different accordeing to thinnning. I spray everything at a flat angle. i like semi gloss it seems to offer the best low sheen without blinding you.
Flat does not spray well I dont know why. I sapry a cover coat and then come back and lay it down thicker. I strain all paint before it goes into gun. latex is so thick sometimes I actually pull the needle gauge out of the end of the gun and open it up
-------------------- You ever notice how easily accessible people are when they are requiring your services but once they get invoice you can't reach them anymore
posted
Just curious..... I'm wondering about overspray. I know with the HVLP you are supposed to get very little; but with you guys spraying at 90 psi or more, do you not get some? Anybody got a roller technique that smooths out pretty well?
-------------------- Dale Feicke Grafix 714 East St. Mendenhall, MS 39114
"I can do all things through Christ, who strengthens me." Posts: 2963 | From: Mendenhall, MS | Registered: Apr 1999
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posted
We don't thin when using a roller. One secret of rolling is not to tickle it too much. We use a 3/8" nap roller cover and put it on and get out. If you keep going back over it the results is very rough, especially in the summer when the paint dries so quickly.
-------------------- Chapman Sign Studio Temple, Texas chapmanstudio@sbcglobal.net Posts: 6306 | From: Temple, Texas, USA | Registered: Nov 1998
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