Today's Message Index:
----------------------
1. 06:27 AM - Re: painting (jimd)
2. 08:23 AM - Re: To Sun 'n Fun Tomorrow (Rick Holland)
3. 10:17 AM - Re: To Sun 'n Fun Tomorrow (Gary Boothe)
4. 05:36 PM - Re: painting (skellytown flyer)
5. 06:02 PM - Re: painting (jimd)
6. 07:14 PM - Re: painting (skellytown flyer)
Message 1
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When you are spraying there are a number of factors that matter for getting a good
finish.
Cheap HVLP guns can work, but they are harder to get good results with than good
HVLP guns, as they usually have a smaller pattern. With an HVLP gun in general
you need lots of volume in your compressor, which practically means at minimum
a 220V compressor that puts out about 15cfm at 40 psi. (There are not any
110V ones that do that, and its hard to get a cheap compressor that does.) So
your $20 gun from HF to work well takes a $400 compressor to get enough air to
work well.
Second thing is the viscosity of the paint, it needs to be well mixed, very uniform
throughout, so it should be ran through a paint filter screen (those little
funnel things they sell at paint stores) to make sure there are no lumps/globs
of paint, so the paint will flow smoothly thru the gun. The thickness of the
paint needs to be correct. Not sure for polyspray what that thickness is, but
you measure it typically with a drip cup. The cup has a precise sized hole
in it, you put the paint in and count the number of drips in a period of time,
if there are not enough the paint is to thick and needs a small amount of whatever
the appropriate thinner is added to it, further mixing, then checking until
the thickness is correct.
Third thing is practice/get it right before you spray your plane. Make up a square
frame out of scrap wood, stretch some cloth over it, shrink it, and then use
it as a test panel to get the priming/painting right before doing it on the
plane. You want to do this like a science experiment, keep track of the temp/humidity,
take notes on how you adjusted the spray from your first light mist
coats thru to the final coat, keep track of the time between coats, and as much
information about what the mix of paint and thinner was as possible. Then when
you have a working combination of settings that gets a result you wouldn't
mind on your plane you use that to actually do the plane.
If you don't have a big enough compressor you can rent one, or use a cheap non-hvlp
gun. HF has one that takes about 6cfm at 40psi, which is about what most
110V compressors can put out, and I am told it gives good results, though I haven't
tried it yet. So for $20-30 you can have something that works well. Of course
its not HVLP so the wasted paint is much higher and that polytone costs
a lot, so you may not end up saving anything over getting a bigger compressor.
Spraying MEK sounds like a bad idea in general though, as it is not something you
should be breathing, don't recall any instructions that say to spray it.. hope
your using a high quality respirator.
I am sure some of the other guys with more painting experience will have advice
for you. With the finish already not to your liking I am not sure what to suggest.
Jim
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http://forums.matronics.com/viewtopic.php?p=239889#239889
Message 2
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| Subject: | Re: To Sun 'n Fun Tomorrow |
So you Southern boys think you are the only ones that get to enjoy the warn
Spring weather down at SNF? I am heading down there on Wednesday, hope to
see you. And yes we are having less than optimal flying weather here in
Denver, attached a picture of the back yard I just took.
Rick
On Fri, Apr 17, 2009 at 3:51 PM, Barry Davis <bed@mindspring.com> wrote:
> This is especially to *Rick Holland*
> **
> Saw on the news this morning that you are in line for 2 to 4 feet of snow
> today. Just wanted to let you know that we are flying down to Florida in the
> morning for Sun n Fun. It should be in the 80's all week. We will be
> thinking of you.
>
> See you at Brodhead
>
> Barry Davis
> Big Piet Builder
>
> *
>
> *
>
>
--
Rick Holland
Castle Rock, Colorado
Message 3
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| Subject: | To Sun 'n Fun Tomorrow |
Looks optimal to me! Time to fit the skiis.
Gary Boothe
Cool, Ca.
Pietenpol
WW Corvair Conversion
Tail done, Fuselage ready for gear
(13 ribs down.)
Do not archive
_____
From: owner-pietenpol-list-server@matronics.com
[mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of Rick Holland
Sent: Saturday, April 18, 2009 8:23 AM
Subject: Re: Pietenpol-List: To Sun 'n Fun Tomorrow
So you Southern boys think you are the only ones that get to enjoy the warn
Spring weather down at SNF? I am heading down there on Wednesday, hope to
see you. And yes we are having less than optimal flying weather here in
Denver, attached a picture of the back yard I just took.
Rick
On Fri, Apr 17, 2009 at 3:51 PM, Barry Davis <bed@mindspring.com> wrote:
This is especially to Rick Holland
Saw on the news this morning that you are in line for 2 to 4 feet of snow
today. Just wanted to let you know that we are flying down to Florida in the
morning for Sun n Fun. It should be in the 80's all week. We will be
thinking of you.
See you at Brodhead
Barry Davis
Big Piet Builder
" target="_blank">http://www.matronics.com/Navigator?Pietenpol-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
--
Rick Holland
Castle Rock, Colorado
Message 4
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Jim thanks for the tips. as usual I didn't buy enough poly-tone to waste much and
didn't try to test spray first. I did find my older cheaper Harbor freight
gun I used to use with better success.it had a cracked neck on the cup that would
cause drips and that is why i bought the more expensive Campbell Hausfeld
gun I used this time.I wet sanded the area some today to smooth it down some and
cleaned the old gun good and patched the cup with JB weld. I'm going to try
to spray with it and expect better results. now that I think about it the last
time I used the new one it didn't work well though not this bad.I will experiment
with lower pressure and test more.I have about a 300 gallon pressure tank
to losing air is not a problem and I have a paint regulator/air dryer so that
isn't really a problem.I expect the newer gun just isn't the right size orifice
for one thing. I'm pretty sure I read that there are at least 3 different
size orifices for different paints and I would expect I have one that is not
suited well to what I'm doing.Raymond
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Message 5
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Wow, 300 gallon pressure tank?
Most big compressor tanks are 60 gallon, thats like 5 big ones.. in one? Must be
gigantic. If your running big hoses and have a dryer it sounds like the only
cheap thing is your gun.
I took the Stewart Systems covering class, my notes had us using; DeVilbiss FinishLine3
HVLP guns with 1.2 to 1.4 tips, and a DuPont M50 viscosity cup, which
we used to measure out 22 drips of the paint with, and then sprayed everything
with at least a 13 cfm compressor behind it.
Anyway I have a cheaper 110V compressor that will not drive a HVLP gun, but I bought
one of the cheap well recommended HF ones and will be trying it out soon.
Experimenting with Latex, which is super thick and hard to get a great finish
with, but it is very inexpensive and pretty easy to fix. I bought paint that
matched my fuselage color for the wings, and actually used some of it to paint
my bathroom (with a roller) looked good, but I digress.
Jim
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=239992#239992
Message 6
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Well it's nothing fancy-I just scrounged a water softener tank from a gas compressor
station I was working at when they removed it. - cleaned it out and mounted
it and set a cheap 5 horse twin cylinder compressor on a stand beside it.
takes a while to get it up to pressure but holds a long time.I don't pressure
it up to but about 80 pounds .
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=240006#240006
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