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-   -   Nelson Paints & his HVLP system (https://www.rcuniverse.com/forum/questions-answers-154/9601773-nelson-paints-his-hvlp-system.html)

bfair67 03-22-2010 06:02 AM

Nelson Paints & his HVLP system
 
Has anybody used this combination to paint a plane ( Nelson Paints & his HVLP Spray System ), if so what was the best ratio of paint to water, and what were the best settings on the Lex-Aire spray gun, for best results and lowest over spray. [sm=confused.gif]

Any help with this would be greatly appriciated. Bill F

Top_Gunn 03-22-2010 11:15 AM

RE: Nelson Paints & his HVLP system
 
I've used it. The ratio of paint to water varies with the color of the paint. It's been a couple of years so I don't remember any details of what I've used. Best advice is to cobble up something you can use to test different settings on and then experiment. Their directions were pretty good, though they aren't very well organized so it pays to read them through a couple of times and note the key things.

One thing I found is that I had to disassemble and clean the gun, using lacquer thinner, between coats; just spraying water through it doesn't do the job. I use distilled water for thinner, because the water I get out of my well is full of chemicals from the softener. Your mileage may vary.

bfair67 03-22-2010 11:31 AM

RE: Nelson Paints & his HVLP system
 
Thank you for the info, every little bit is helpful.

buzzard bait 03-22-2010 08:25 PM

RE: Nelson Paints & his HVLP system
 
I wonder if denatured alcohol would do the trick instead of the lacquer thinner?

Jim

Top_Gunn 03-23-2010 07:45 AM

RE: Nelson Paints & his HVLP system
 
Bill,

I looked through my files and found some very sketchy notes that I made in the past when using Nelson paint and their HVLP system. For what it's worth, I thinned white paint (probably the thickest) "50/50 or just a little less." Red paint was thinned "almost 50/50." For white, I had the front ring on the gun 1 1/2 turns out, and the paint knob (on the back of the gun) 2 turns out. One note says "air about 80%," which I think means I had the air gadget on the hose not quite fully open. For red, I had the paint knob out about 1 1/2 turns and about 3/4 air, also with the front ring 1 1/2 turns out. My notes on blue paint are incomprehensible, even to me.

I hope this helps, at least as a starting point. Overspray hasn't been a serious problem, but when I paint in the basement I make a sort of "room" by hanging cheap plastic sheets from Home Depot from the ceiling to cut off the painting space from the rest of the basement. This is more to keep dust out than because of overspray. I keep a large bucket full of well water to immerse the gun in after each coat, but as I noted before I still have to clean it after each coat. This is not a problem as it takes about two minutes and you've got to wait longer than that between coats anyway.

As for brush painting, I've done that on a cowl with their primer first, then white over that. No notes, though. Came out fine.

For masking, I've used Tamiya tape (a plastic-modeling favorite) or frisket paper for the actual line, with drafting tape over that to attach Saran wrap or the like to cover the rest of the non-painted area. Get the tape off as fast as you can after painting; if the paint dries first, removing the tape will pull some of it off. They want you to take it off after a ridiculously short time, but you can't really do that if you are using multiple coats, and you have to use multiple coats. Just get it off as soon as you've done the last coat, and don't take a lunch break between coats.

The final results have been good. I add a touch of blue to white because I've heard it keeps it from yellowing. If you do that, be careful; I have a Kadet Senior that's supposed to be red and white, but the bottom of the wing is very light blue, though you can't tell in the air.

bfair67 03-23-2010 09:18 AM

RE: Nelson Paints & his HVLP system
 
Thanks Top Gun this information will be very helpful, I appreciate it.


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